{"type":"file-history-snapshot","messageId":"167aeef9-9a54-4dde-b724-900d9f7638ae","snapshot":{"messageId":"167aeef9-9a54-4dde-b724-900d9f7638ae","trackedFileBackups":{},"timestamp":"2026-03-13T06:51:34.770Z"},"isSnapshotUpdate":false}
{"parentUuid":null,"isSidechain":false,"type":"progress","data":{"type":"hook_progress","hookEvent":"SessionStart","hookName":"SessionStart:clear","command":"entire hooks claude-code session-start"},"parentToolUseID":"d42d9a0e-d8d8-4b03-8530-6b600c20f5fc","toolUseID":"d42d9a0e-d8d8-4b03-8530-6b600c20f5fc","timestamp":"2026-03-13T06:51:34.728Z","uuid":"dd66862b-becb-474c-9673-12d9c2fca5ef","userType":"external","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"39705f8c-1691-4d60-b0aa-39f588ed9dcf","version":"2.1.74","gitBranch":"hotfix","slug":"linear-roaming-glade"}
{"parentUuid":"dd66862b-becb-474c-9673-12d9c2fca5ef","isSidechain":false,"promptId":"a631224c-8362-4377-bee6-9ff6c4b66c68","type":"user","message":{"role":"user","content":"Implement the following plan:\n\n# Metricstore Memory Explosion Fix Plan\n\n## Root Cause Analysis\n\nThe memory explosion has two interacting causes:\n1. **Emergency free mechanism is broken** — freed buffers go back to pool, pool isn't cleared after the loop, so `mem.Alloc` never decreases. The loop runs 100 iterations uselessly, then waits 1 hour before trying again. Memory grows unchecked.\n2. **Batch abort on write error** — a single out-of-order timestamp aborts the entire NATS batch (`lineprotocol.go:361`). This causes data gaps across many metrics/hosts, producing the \"does not align\" warnings during reads. The same instability that causes timestamp issues causes bursts of data that grow memory.\n\n## Changes\n\n### 1. `pkg/metricstore/metricstore.go` — Fix MemoryUsageTracker (lines 383-476)\n- Remove premature `bufferPool.Clear()` + log at lines 431-432\n- In emergency loop (lines 439-458): add `bufferPool.Clear()` + `runtime.GC()` before `ReadMemStats` at line 455\n- After loop: add `bufferPool.Clear()` + uncomment `debug.FreeOSMemory()` (lines 460-462)\n- Add adaptive ticker: if memory > 80% cap, reset ticker to 30s; else normal interval\n- Replace progressive `ForceFree` loop with `Free(nil, threshold)` using progressive threshold (fewer tree traversals, more effective)\n\n### 2. `pkg/metricstore/config.go` — Reduce check interval (line 56)\n- Change `DefaultMemoryUsageTrackerInterval` from `1 * time.Hour` to `5 * time.Minute`\n- Add `MemoryCheckInterval string` field to `MetricStoreConfig`\n\n### 3. `pkg/metricstore/lineprotocol.go` — Don't abort batch on write error (lines 361-363)\n- Change `return err` to `cclog.Warn(...)` + `continue` so remaining lines in the NATS message are processed\n\n### 4. `pkg/metricstore/level.go` — Prune empty levels after free\n- Modify `free()` to return emptiness flag; parent deletes empty children from map\n- Improve `sizeInBytes()` to count buffer struct overhead (not just float data)\n\n### 5. `pkg/metricstore/buffer.go` — Add `bufferCount()` helper\n- Count linked-list length for overhead calculation in `sizeInBytes()`\n\n## Verification\n```bash\ngo test ./pkg/metricstore/...\n```\n\n\nIf you need specific details from before exiting plan mode (like exact code snippets, error messages, or content you generated), read the full transcript at: /Users/jan/.claude/projects/-Users-jan-prg-ClusterCockpit-cc-backend/7e911723-3abe-436f-b672-d1eef82d81c0.jsonl"},"uuid":"167aeef9-9a54-4dde-b724-900d9f7638ae","timestamp":"2026-03-13T06:51:31.951Z","planContent":"# Metricstore Memory Explosion Fix Plan\n\n## Root Cause Analysis\n\nThe memory explosion has two interacting causes:\n1. **Emergency free mechanism is broken** — freed buffers go back to pool, pool isn't cleared after the loop, so `mem.Alloc` never decreases. The loop runs 100 iterations uselessly, then waits 1 hour before trying again. Memory grows unchecked.\n2. **Batch abort on write error** — a single out-of-order timestamp aborts the entire NATS batch (`lineprotocol.go:361`). This causes data gaps across many metrics/hosts, producing the \"does not align\" warnings during reads. The same instability that causes timestamp issues causes bursts of data that grow memory.\n\n## Changes\n\n### 1. `pkg/metricstore/metricstore.go` — Fix MemoryUsageTracker (lines 383-476)\n- Remove premature `bufferPool.Clear()` + log at lines 431-432\n- In emergency loop (lines 439-458): add `bufferPool.Clear()` + `runtime.GC()` before `ReadMemStats` at line 455\n- After loop: add `bufferPool.Clear()` + uncomment `debug.FreeOSMemory()` (lines 460-462)\n- Add adaptive ticker: if memory > 80% cap, reset ticker to 30s; else normal interval\n- Replace progressive `ForceFree` loop with `Free(nil, threshold)` using progressive threshold (fewer tree traversals, more effective)\n\n### 2. `pkg/metricstore/config.go` — Reduce check interval (line 56)\n- Change `DefaultMemoryUsageTrackerInterval` from `1 * time.Hour` to `5 * time.Minute`\n- Add `MemoryCheckInterval string` field to `MetricStoreConfig`\n\n### 3. `pkg/metricstore/lineprotocol.go` — Don't abort batch on write error (lines 361-363)\n- Change `return err` to `cclog.Warn(...)` + `continue` so remaining lines in the NATS message are processed\n\n### 4. `pkg/metricstore/level.go` — Prune empty levels after free\n- Modify `free()` to return emptiness flag; parent deletes empty children from map\n- Improve `sizeInBytes()` to count buffer struct overhead (not just float data)\n\n### 5. `pkg/metricstore/buffer.go` — Add `bufferCount()` helper\n- Count linked-list length for overhead calculation in `sizeInBytes()`\n\n## Verification\n```bash\ngo test ./pkg/metricstore/...\n```\n","userType":"external","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"39705f8c-1691-4d60-b0aa-39f588ed9dcf","version":"2.1.74","gitBranch":"hotfix","slug":"linear-roaming-glade"}
{"parentUuid":"167aeef9-9a54-4dde-b724-900d9f7638ae","isSidechain":false,"message":{"model":"claude-opus-4-6","id":"msg_01FjH14n4qJUyKjPEZ5EwA9e","type":"message","role":"assistant","content":[{"type":"thinking","thinking":"","signature":"EogCCkYICxgCKkBW59RCY6tGSB56nAGA//z3lRvJEDn5iJLOClMZGjxNRiWuAGiCmaIgNTdta1Sy/TNzx1kW0Sge7rGR/PxRSRnzEgxK8b8uwraTQBzMe5oaDPJaMCG8RF5eeZwUUiIwnqHPOdpt6cL6OQF8XcJa7007BGRTJo7lJUyVZ0a1dmw5UmieO+gnKWqUWGSD0QTZKnDm9NBDNIVf65zz6tniU2i+yXhPvfQxcS7iC1lO9kbcJObsJChK9BVhCRN6sWi7rWPekQrMC0swmq+4SemtgENuUgtlIohUlJUGFn6tqPFU1m4yKiA+XlHLO20GH/c/hLYfsb6Rx9X4Kc+K6DFZ62/xGAE="}],"stop_reason":null,"stop_sequence":null,"usage":{"input_tokens":3,"cache_creation_input_tokens":4536,"cache_read_input_tokens":14327,"cache_creation":{"ephemeral_5m_input_tokens":0,"ephemeral_1h_input_tokens":4536},"output_tokens":10,"service_tier":"standard","inference_geo":"not_available"}},"requestId":"req_011CYzdsXrmXTNVHFwPnWdu9","type":"assistant","uuid":"8df415c0-2fb7-471e-9d6c-f46271816d9b","timestamp":"2026-03-13T06:51:36.897Z","userType":"external","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"39705f8c-1691-4d60-b0aa-39f588ed9dcf","version":"2.1.74","gitBranch":"hotfix","slug":"linear-roaming-glade"}
{"parentUuid":"8df415c0-2fb7-471e-9d6c-f46271816d9b","isSidechain":false,"message":{"model":"claude-opus-4-6","id":"msg_01FjH14n4qJUyKjPEZ5EwA9e","type":"message","role":"assistant","content":[{"type":"text","text":"Let me read the relevant files first."}],"stop_reason":null,"stop_sequence":null,"usage":{"input_tokens":3,"cache_creation_input_tokens":4536,"cache_read_input_tokens":14327,"cache_creation":{"ephemeral_5m_input_tokens":0,"ephemeral_1h_input_tokens":4536},"output_tokens":10,"service_tier":"standard","inference_geo":"not_available"}},"requestId":"req_011CYzdsXrmXTNVHFwPnWdu9","type":"assistant","uuid":"2e4b496b-5820-4fa6-beb4-a6d6d85b72b8","timestamp":"2026-03-13T06:51:37.450Z","userType":"external","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"39705f8c-1691-4d60-b0aa-39f588ed9dcf","version":"2.1.74","gitBranch":"hotfix","slug":"linear-roaming-glade"}
{"parentUuid":"2e4b496b-5820-4fa6-beb4-a6d6d85b72b8","isSidechain":false,"message":{"model":"claude-opus-4-6","id":"msg_01FjH14n4qJUyKjPEZ5EwA9e","type":"message","role":"assistant","content":[{"type":"tool_use","id":"toolu_01EbJddfnEeN7LrkG2yCuCRM","name":"Read","input":{"file_path":"/Users/jan/prg/ClusterCockpit/cc-backend/pkg/metricstore/metricstore.go"},"caller":{"type":"direct"}}],"stop_reason":null,"stop_sequence":null,"usage":{"input_tokens":3,"cache_creation_input_tokens":4536,"cache_read_input_tokens":14327,"cache_creation":{"ephemeral_5m_input_tokens":0,"ephemeral_1h_input_tokens":4536},"output_tokens":10,"service_tier":"standard","inference_geo":"not_available"}},"requestId":"req_011CYzdsXrmXTNVHFwPnWdu9","type":"assistant","uuid":"d8d1a8d8-96b7-4919-bcc6-949d23a60249","timestamp":"2026-03-13T06:51:38.355Z","userType":"external","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"39705f8c-1691-4d60-b0aa-39f588ed9dcf","version":"2.1.74","gitBranch":"hotfix","slug":"linear-roaming-glade"}
{"parentUuid":"d8d1a8d8-96b7-4919-bcc6-949d23a60249","isSidechain":false,"type":"progress","data":{"type":"hook_progress","hookEvent":"PostToolUse","hookName":"PostToolUse:Read","command":"callback"},"parentToolUseID":"toolu_01EbJddfnEeN7LrkG2yCuCRM","toolUseID":"toolu_01EbJddfnEeN7LrkG2yCuCRM","timestamp":"2026-03-13T06:51:38.364Z","uuid":"4766aebb-ec10-4efc-98eb-c2e1664f12a4","userType":"external","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"39705f8c-1691-4d60-b0aa-39f588ed9dcf","version":"2.1.74","gitBranch":"hotfix","slug":"linear-roaming-glade"}
{"parentUuid":"d8d1a8d8-96b7-4919-bcc6-949d23a60249","isSidechain":false,"promptId":"a631224c-8362-4377-bee6-9ff6c4b66c68","type":"user","message":{"role":"user","content":[{"tool_use_id":"toolu_01EbJddfnEeN7LrkG2yCuCRM","type":"tool_result","content":"     1→// Copyright (C) NHR@FAU, University Erlangen-Nuremberg.\n     2→// All rights reserved. This file is part of cc-backend.\n     3→// Use of this source code is governed by a MIT-style\n     4→// license that can be found in the LICENSE file.\n     5→\n     6→// Package metricstore provides an efficient in-memory time-series metric storage system\n     7→// with support for hierarchical data organization, checkpointing, and archiving.\n     8→//\n     9→// The package organizes metrics in a tree structure (cluster → host → component) and\n    10→// provides concurrent read/write access to metric data with configurable aggregation strategies.\n    11→// Background goroutines handle periodic checkpointing (JSON or Avro format), archiving old data,\n    12→// and enforcing retention policies.\n    13→//\n    14→// Key features:\n    15→//   - In-memory metric storage with configurable retention\n    16→//   - Hierarchical data organization (selectors)\n    17→//   - Concurrent checkpoint/archive workers\n    18→//   - Support for sum and average aggregation\n    19→//   - NATS integration for metric ingestion\n    20→package metricstore\n    21→\n    22→import (\n    23→\t\"bytes\"\n    24→\t\"context\"\n    25→\t\"encoding/json\"\n    26→\t\"errors\"\n    27→\t\"fmt\"\n    28→\t\"runtime\"\n    29→\t\"runtime/debug\"\n    30→\t\"slices\"\n    31→\t\"sync\"\n    32→\t\"time\"\n    33→\n    34→\t\"github.com/ClusterCockpit/cc-backend/internal/config\"\n    35→\tcclog \"github.com/ClusterCockpit/cc-lib/v2/ccLogger\"\n    36→\t\"github.com/ClusterCockpit/cc-lib/v2/resampler\"\n    37→\t\"github.com/ClusterCockpit/cc-lib/v2/schema\"\n    38→\t\"github.com/ClusterCockpit/cc-lib/v2/util\"\n    39→)\n    40→\n    41→// GlobalState holds the global state for the metric store with thread-safe access.\n    42→type GlobalState struct {\n    43→\tmu                sync.RWMutex\n    44→\tlastRetentionTime int64\n    45→\tselectorsExcluded bool\n    46→}\n    47→\n    48→var (\n    49→\tsingleton  sync.Once\n    50→\tmsInstance *MemoryStore\n    51→\t// shutdownFunc stores the context cancellation function created in Init\n    52→\t// and is called during Shutdown to cancel all background goroutines\n    53→\tshutdownFunc   context.CancelFunc\n    54→\tshutdownFuncMu sync.Mutex // Protects shutdownFunc from concurrent access\n    55→\t// Create a global instance\n    56→\tstate = &GlobalState{}\n    57→)\n    58→\n    59→// NodeProvider provides information about nodes currently in use by running jobs.\n    60→//\n    61→// This interface allows metricstore to query job information without directly\n    62→// depending on the repository package, breaking the import cycle.\n    63→//\n    64→// Implementations should return nodes that are actively processing jobs started\n    65→// before the given timestamp. These nodes will be excluded from retention-based\n    66→// garbage collection to prevent data loss for jobs that are still running or\n    67→// recently completed.\n    68→type NodeProvider interface {\n    69→\t// GetUsedNodes returns a map of cluster names to sorted lists of unique hostnames\n    70→\t// that are currently in use by jobs that started before the given timestamp.\n    71→\t//\n    72→\t// Parameters:\n    73→\t//   - ts: Unix timestamp threshold - returns nodes with jobs started before this time\n    74→\t//\n    75→\t// Returns:\n    76→\t//   - Map of cluster names to lists of node hostnames that should be excluded from garbage collection\n    77→\t//   - Error if the query fails\n    78→\tGetUsedNodes(ts int64) (map[string][]string, error)\n    79→}\n    80→\n    81→// Metric represents a single metric data point to be written to the store.\n    82→type Metric struct {\n    83→\tName  string\n    84→\tValue schema.Float\n    85→\t// MetricConfig contains frequency and aggregation settings for this metric.\n    86→\t// If Frequency is 0, configuration will be looked up from MemoryStore.Metrics during Write().\n    87→\tMetricConfig MetricConfig\n    88→}\n    89→\n    90→// MemoryStore is the main in-memory time-series metric storage implementation.\n    91→//\n    92→// It organizes metrics in a hierarchical tree structure where each level represents\n    93→// a component of the system hierarchy (e.g., cluster → host → CPU). Each level can\n    94→// store multiple metrics as time-series buffers.\n    95→//\n    96→// The store is initialized as a singleton via InitMetrics() and accessed via GetMemoryStore().\n    97→// All public methods are safe for concurrent use.\n    98→type MemoryStore struct {\n    99→\tMetrics      map[string]MetricConfig\n   100→\troot         Level\n   101→\tnodeProvider NodeProvider\n   102→}\n   103→\n   104→// Init initializes the metric store from configuration and starts background workers.\n   105→//\n   106→// This function must be called exactly once before any other metricstore operations.\n   107→// It performs the following initialization steps:\n   108→//  1. Validates and decodes the metric store configuration\n   109→//  2. Configures worker pool size (defaults to NumCPU/2+1, max 10)\n   110→//  3. Loads metric configurations from all registered clusters\n   111→//  4. Restores checkpoints within the retention window\n   112→//  5. Starts background workers for retention, checkpointing, archiving, and monitoring\n   113→//  6. Optionally subscribes to NATS for real-time metric ingestion\n   114→//\n   115→// Parameters:\n   116→//   - rawConfig: JSON configuration for the metric store (see MetricStoreConfig)\n   117→//   - wg: WaitGroup that will be incremented for each background goroutine started\n   118→//\n   119→// The function will call cclog.Fatal on critical errors during initialization.\n   120→// Use Shutdown() to cleanly stop all background workers started by Init().\n   121→//\n   122→// Note: Signal handling must be implemented by the caller. Call Shutdown() when\n   123→// receiving termination signals to ensure checkpoint data is persisted.\n   124→func Init(rawConfig json.RawMessage, metrics map[string]MetricConfig, wg *sync.WaitGroup) {\n   125→\tstartupTime := time.Now()\n   126→\n   127→\tif rawConfig != nil {\n   128→\t\tconfig.Validate(configSchema, rawConfig)\n   129→\t\tdec := json.NewDecoder(bytes.NewReader(rawConfig))\n   130→\t\tdec.DisallowUnknownFields()\n   131→\t\tif err := dec.Decode(&Keys); err != nil {\n   132→\t\t\tcclog.Abortf(\"[METRICSTORE]> Metric Store Config Init: Could not decode config file '%s'.\\nError: %s\\n\", rawConfig, err.Error())\n   133→\t\t}\n   134→\t}\n   135→\n   136→\t// Set NumWorkers from config or use default\n   137→\tif Keys.NumWorkers <= 0 {\n   138→\t\tKeys.NumWorkers = min(runtime.NumCPU()/2+1, DefaultMaxWorkers)\n   139→\t}\n   140→\tcclog.Debugf(\"[METRICSTORE]> Using %d workers for checkpoint/archive operations\\n\", Keys.NumWorkers)\n   141→\n   142→\t// Pass the config.MetricStoreKeys\n   143→\tInitMetrics(metrics)\n   144→\n   145→\tms := GetMemoryStore()\n   146→\n   147→\td, err := time.ParseDuration(Keys.RetentionInMemory)\n   148→\tif err != nil {\n   149→\t\tcclog.Fatal(err)\n   150→\t}\n   151→\n   152→\trestoreFrom := startupTime.Add(-d)\n   153→\tcclog.Infof(\"[METRICSTORE]> Loading checkpoints newer than %s\\n\", restoreFrom.Format(time.RFC3339))\n   154→\tfiles, err := ms.FromCheckpointFiles(Keys.Checkpoints.RootDir, restoreFrom.Unix())\n   155→\tloadedData := ms.SizeInBytes() / 1024 / 1024 // In MB\n   156→\tif err != nil {\n   157→\t\tcclog.Fatalf(\"[METRICSTORE]> Loading checkpoints failed: %s\\n\", err.Error())\n   158→\t} else {\n   159→\t\tcclog.Infof(\"[METRICSTORE]> Checkpoints loaded (%d files, %d MB, that took %fs)\\n\", files, loadedData, time.Since(startupTime).Seconds())\n   160→\t}\n   161→\n   162→\t// Try to use less memory by forcing a GC run here and then\n   163→\t// lowering the target percentage. The default of 100 means\n   164→\t// that only once the ratio of new allocations execeds the\n   165→\t// previously active heap, a GC is triggered.\n   166→\t// Forcing a GC here will set the \"previously active heap\"\n   167→\t// to a minumum.\n   168→\t// runtime.GC()\n   169→\n   170→\tctx, shutdown := context.WithCancel(context.Background())\n   171→\n   172→\tRetention(wg, ctx)\n   173→\tCheckpointing(wg, ctx)\n   174→\tCleanUp(wg, ctx)\n   175→\tWALStaging(wg, ctx)\n   176→\tMemoryUsageTracker(wg, ctx)\n   177→\n   178→\t// Note: Signal handling has been removed from this function.\n   179→\t// The caller is responsible for handling shutdown signals and calling\n   180→\t// the shutdown() function when appropriate.\n   181→\t// Store the shutdown function for later use by Shutdown()\n   182→\tshutdownFuncMu.Lock()\n   183→\tshutdownFunc = shutdown\n   184→\tshutdownFuncMu.Unlock()\n   185→\n   186→\tif Keys.Subscriptions != nil {\n   187→\t\terr = ReceiveNats(ms, 1, ctx)\n   188→\t\tif err != nil {\n   189→\t\t\tcclog.Fatal(err)\n   190→\t\t}\n   191→\t}\n   192→}\n   193→\n   194→// InitMetrics initializes the singleton MemoryStore instance with the given metric configurations.\n   195→//\n   196→// This function must be called before GetMemoryStore() and can only be called once due to\n   197→// the singleton pattern. It assigns each metric an internal offset for efficient buffer indexing.\n   198→//\n   199→// Parameters:\n   200→//   - metrics: Map of metric names to their configurations (frequency and aggregation strategy)\n   201→//\n   202→// Panics if any metric has Frequency == 0, which indicates an invalid configuration.\n   203→//\n   204→// After this call, the global msInstance is ready for use via GetMemoryStore().\n   205→func InitMetrics(metrics map[string]MetricConfig) {\n   206→\tsingleton.Do(func() {\n   207→\t\toffset := 0\n   208→\t\tfor key, cfg := range metrics {\n   209→\t\t\tif cfg.Frequency == 0 {\n   210→\t\t\t\tpanic(\"[METRICSTORE]> invalid frequency\")\n   211→\t\t\t}\n   212→\n   213→\t\t\tmetrics[key] = MetricConfig{\n   214→\t\t\t\tFrequency:   cfg.Frequency,\n   215→\t\t\t\tAggregation: cfg.Aggregation,\n   216→\t\t\t\toffset:      offset,\n   217→\t\t\t}\n   218→\t\t\toffset += 1\n   219→\t\t}\n   220→\n   221→\t\tmsInstance = &MemoryStore{\n   222→\t\t\troot: Level{\n   223→\t\t\t\tmetrics:  make([]*buffer, len(metrics)),\n   224→\t\t\t\tchildren: make(map[string]*Level),\n   225→\t\t\t},\n   226→\t\t\tMetrics: metrics,\n   227→\t\t}\n   228→\t})\n   229→}\n   230→\n   231→// GetMemoryStore returns the singleton MemoryStore instance.\n   232→//\n   233→// Returns the initialized MemoryStore singleton. Calls cclog.Fatal if InitMetrics() was not called first.\n   234→//\n   235→// This function is safe for concurrent use after initialization.\n   236→func GetMemoryStore() *MemoryStore {\n   237→\tif msInstance == nil {\n   238→\t\tcclog.Warnf(\"[METRICSTORE]> MemoryStore not initialized!\")\n   239→\t}\n   240→\n   241→\treturn msInstance\n   242→}\n   243→\n   244→func (ms *MemoryStore) GetMetricFrequency(metricName string) (int64, error) {\n   245→\tif metric, ok := ms.Metrics[metricName]; ok {\n   246→\t\treturn metric.Frequency, nil\n   247→\t}\n   248→\treturn 0, fmt.Errorf(\"[METRICSTORE]> metric %s not found\", metricName)\n   249→}\n   250→\n   251→// SetNodeProvider sets the NodeProvider implementation for the MemoryStore.\n   252→// This must be called during initialization to provide job state information\n   253→// for selective buffer retention during Free operations.\n   254→// If not set, the Free function will fall back to freeing all buffers.\n   255→func (ms *MemoryStore) SetNodeProvider(provider NodeProvider) {\n   256→\tms.nodeProvider = provider\n   257→}\n   258→\n   259→// Shutdown performs a graceful shutdown of the metric store.\n   260→//\n   261→// This function cancels all background goroutines started by Init() and writes\n   262→// a final checkpoint to disk before returning. It should be called when the\n   263→// application receives a termination signal.\n   264→//\n   265→// The function will:\n   266→//  1. Cancel the context to stop all background workers\n   267→//  2. Close the WAL messages channel if using WAL format\n   268→//  3. Write a final checkpoint to preserve in-memory data\n   269→//  4. Log any errors encountered during shutdown\n   270→//\n   271→// Note: This function blocks until the final checkpoint is written.\n   272→func Shutdown() {\n   273→\tshutdownFuncMu.Lock()\n   274→\tdefer shutdownFuncMu.Unlock()\n   275→\tif shutdownFunc != nil {\n   276→\t\tshutdownFunc()\n   277→\t}\n   278→\n   279→\tif Keys.Checkpoints.FileFormat == \"wal\" {\n   280→\t\tclose(WALMessages)\n   281→\t}\n   282→\n   283→\tcclog.Infof(\"[METRICSTORE]> Writing to '%s'...\\n\", Keys.Checkpoints.RootDir)\n   284→\tvar files int\n   285→\tvar err error\n   286→\n   287→\tms := GetMemoryStore()\n   288→\n   289→\tlastCheckpointMu.Lock()\n   290→\tfrom := lastCheckpoint\n   291→\tlastCheckpointMu.Unlock()\n   292→\n   293→\tif Keys.Checkpoints.FileFormat == \"wal\" {\n   294→\t\tvar hostDirs []string\n   295→\t\tfiles, hostDirs, err = ms.ToCheckpointWAL(Keys.Checkpoints.RootDir, from.Unix(), time.Now().Unix())\n   296→\t\tif err == nil {\n   297→\t\t\tRotateWALFilesAfterShutdown(hostDirs)\n   298→\t\t}\n   299→\t} else {\n   300→\t\tfiles, err = ms.ToCheckpoint(Keys.Checkpoints.RootDir, from.Unix(), time.Now().Unix())\n   301→\t}\n   302→\n   303→\tif err != nil {\n   304→\t\tcclog.Errorf(\"[METRICSTORE]> Writing checkpoint failed: %s\\n\", err.Error())\n   305→\t}\n   306→\tcclog.Infof(\"[METRICSTORE]> Done! (%d files written)\\n\", files)\n   307→}\n   308→\n   309→// Retention starts a background goroutine that periodically frees old metric data.\n   310→//\n   311→// This worker runs at half the retention interval and calls Free() to remove buffers\n   312→// older than the configured retention time. It respects the NodeProvider to preserve\n   313→// data for nodes with active jobs.\n   314→//\n   315→// Parameters:\n   316→//   - wg: WaitGroup to signal completion when context is cancelled\n   317→//   - ctx: Context for cancellation signal\n   318→//\n   319→// The goroutine exits when ctx is cancelled.\n   320→func Retention(wg *sync.WaitGroup, ctx context.Context) {\n   321→\tms := GetMemoryStore()\n   322→\n   323→\twg.Go(func() {\n   324→\t\td, err := time.ParseDuration(Keys.RetentionInMemory)\n   325→\t\tif err != nil {\n   326→\t\t\tcclog.Fatal(err)\n   327→\t\t}\n   328→\t\tif d <= 0 {\n   329→\t\t\treturn\n   330→\t\t}\n   331→\n   332→\t\ttickInterval := d / 2\n   333→\t\tif tickInterval <= 0 {\n   334→\t\t\treturn\n   335→\t\t}\n   336→\t\tticker := time.NewTicker(tickInterval)\n   337→\t\tdefer ticker.Stop()\n   338→\n   339→\t\tfor {\n   340→\t\t\tselect {\n   341→\t\t\tcase <-ctx.Done():\n   342→\t\t\t\treturn\n   343→\t\t\tcase <-ticker.C:\n   344→\t\t\t\tstate.mu.Lock()\n   345→\n   346→\t\t\t\tt := time.Now().Add(-d)\n   347→\n   348→\t\t\t\tstate.lastRetentionTime = t.Unix()\n   349→\n   350→\t\t\t\tcclog.Infof(\"[METRICSTORE]> start freeing buffers (older than %s)...\\n\", t.Format(time.RFC3339))\n   351→\n   352→\t\t\t\tfreed, err := Free(ms, t)\n   353→\t\t\t\tif err != nil {\n   354→\t\t\t\t\tcclog.Errorf(\"[METRICSTORE]> freeing up buffers failed: %s\\n\", err.Error())\n   355→\t\t\t\t} else {\n   356→\t\t\t\t\tcclog.Infof(\"[METRICSTORE]> done: %d buffers freed\\n\", freed)\n   357→\t\t\t\t}\n   358→\n   359→\t\t\t\tstate.mu.Unlock()\n   360→\n   361→\t\t\t\t// Clean up the buffer pool\n   362→\t\t\t\tbufferPool.Clean(state.lastRetentionTime)\n   363→\t\t\t}\n   364→\t\t}\n   365→\t})\n   366→}\n   367→\n   368→// MemoryUsageTracker starts a background goroutine that monitors memory usage.\n   369→//\n   370→// This worker checks actual process memory usage (via runtime.MemStats) periodically\n   371→// and force-frees buffers if memory exceeds the configured cap. It uses FreeOSMemory()\n   372→// to return memory to the OS after freeing buffers, avoiding aggressive GC that causes\n   373→// performance issues.\n   374→//\n   375→// The tracker logs both actual memory usage (heap allocated) and metric data size for\n   376→// visibility into memory overhead from Go runtime structures and allocations.\n   377→//\n   378→// Parameters:\n   379→//   - wg: WaitGroup to signal completion when context is cancelled\n   380→//   - ctx: Context for cancellation signal\n   381→//\n   382→// The goroutine exits when ctx is cancelled.\n   383→func MemoryUsageTracker(wg *sync.WaitGroup, ctx context.Context) {\n   384→\tms := GetMemoryStore()\n   385→\n   386→\twg.Go(func() {\n   387→\t\td := DefaultMemoryUsageTrackerInterval\n   388→\n   389→\t\tif d <= 0 {\n   390→\t\t\treturn\n   391→\t\t}\n   392→\n   393→\t\tticker := time.NewTicker(d)\n   394→\t\tdefer ticker.Stop()\n   395→\n   396→\t\tfor {\n   397→\t\t\tselect {\n   398→\t\t\tcase <-ctx.Done():\n   399→\t\t\t\treturn\n   400→\t\t\tcase <-ticker.C:\n   401→\t\t\t\tvar mem runtime.MemStats\n   402→\t\t\t\truntime.ReadMemStats(&mem)\n   403→\t\t\t\tactualMemoryGB := float64(mem.Alloc) / 1e9\n   404→\t\t\t\tmetricDataGB := ms.SizeInGB()\n   405→\t\t\t\tcclog.Infof(\"[METRICSTORE]> memory usage: %.2f GB actual (%.2f GB metric data)\", actualMemoryGB, metricDataGB)\n   406→\n   407→\t\t\t\tfreedExcluded := 0\n   408→\t\t\t\tfreedEmergency := 0\n   409→\t\t\t\tvar err error\n   410→\n   411→\t\t\t\tstate.mu.RLock()\n   412→\t\t\t\tlastRetention := state.lastRetentionTime\n   413→\t\t\t\tselectorsExcluded := state.selectorsExcluded\n   414→\t\t\t\tstate.mu.RUnlock()\n   415→\n   416→\t\t\t\tif lastRetention != 0 && selectorsExcluded {\n   417→\t\t\t\t\tfreedExcluded, err = ms.Free(nil, lastRetention)\n   418→\t\t\t\t\tif err != nil {\n   419→\t\t\t\t\t\tcclog.Errorf(\"[METRICSTORE]> error while force-freeing the excluded buffers: %s\", err)\n   420→\t\t\t\t\t}\n   421→\n   422→\t\t\t\t\tif freedExcluded > 0 {\n   423→\t\t\t\t\t\tdebug.FreeOSMemory()\n   424→\t\t\t\t\t\tcclog.Infof(\"[METRICSTORE]> done: %d excluded buffers force-freed\", freedExcluded)\n   425→\t\t\t\t\t}\n   426→\t\t\t\t}\n   427→\n   428→\t\t\t\truntime.ReadMemStats(&mem)\n   429→\t\t\t\tactualMemoryGB = float64(mem.Alloc) / 1e9\n   430→\n   431→\t\t\t\tbufferPool.Clear()\n   432→\t\t\t\tcclog.Infof(\"[METRICSTORE]> Cleaned up bufferPool\\n\")\n   433→\n   434→\t\t\t\tif actualMemoryGB > float64(Keys.MemoryCap) {\n   435→\t\t\t\t\tcclog.Warnf(\"[METRICSTORE]> memory usage %.2f GB exceeds cap %d GB, starting emergency buffer freeing\", actualMemoryGB, Keys.MemoryCap)\n   436→\n   437→\t\t\t\t\tconst maxIterations = 100\n   438→\n   439→\t\t\t\t\tfor i := range maxIterations {\n   440→\t\t\t\t\t\tif actualMemoryGB < float64(Keys.MemoryCap) {\n   441→\t\t\t\t\t\t\tbreak\n   442→\t\t\t\t\t\t}\n   443→\n   444→\t\t\t\t\t\tfreed, err := ms.ForceFree()\n   445→\t\t\t\t\t\tif err != nil {\n   446→\t\t\t\t\t\t\tcclog.Errorf(\"[METRICSTORE]> error while force-freeing buffers: %s\", err)\n   447→\t\t\t\t\t\t}\n   448→\t\t\t\t\t\tif freed == 0 {\n   449→\t\t\t\t\t\t\tcclog.Errorf(\"[METRICSTORE]> no more buffers to free after %d emergency frees, memory usage %.2f GB still exceeds cap %d GB\", freedEmergency, actualMemoryGB, Keys.MemoryCap)\n   450→\t\t\t\t\t\t\tbreak\n   451→\t\t\t\t\t\t}\n   452→\t\t\t\t\t\tfreedEmergency += freed\n   453→\n   454→\t\t\t\t\t\tif i%10 == 0 && freedEmergency > 0 {\n   455→\t\t\t\t\t\t\truntime.ReadMemStats(&mem)\n   456→\t\t\t\t\t\t\tactualMemoryGB = float64(mem.Alloc) / 1e9\n   457→\t\t\t\t\t\t}\n   458→\t\t\t\t\t}\n   459→\n   460→\t\t\t\t\t// if freedEmergency > 0 {\n   461→\t\t\t\t\t// \tdebug.FreeOSMemory()\n   462→\t\t\t\t\t// }\n   463→\n   464→\t\t\t\t\truntime.ReadMemStats(&mem)\n   465→\t\t\t\t\tactualMemoryGB = float64(mem.Alloc) / 1e9\n   466→\n   467→\t\t\t\t\tif actualMemoryGB >= float64(Keys.MemoryCap) {\n   468→\t\t\t\t\t\tcclog.Errorf(\"[METRICSTORE]> after %d emergency frees, memory usage %.2f GB still at/above cap %d GB\", freedEmergency, actualMemoryGB, Keys.MemoryCap)\n   469→\t\t\t\t\t} else {\n   470→\t\t\t\t\t\tcclog.Infof(\"[METRICSTORE]> emergency freeing complete: %d buffers freed, memory now %.2f GB\", freedEmergency, actualMemoryGB)\n   471→\t\t\t\t\t}\n   472→\t\t\t\t}\n   473→\t\t\t}\n   474→\t\t}\n   475→\t})\n   476→}\n   477→\n   478→// Free removes metric data older than the given time while preserving data for active nodes.\n   479→//\n   480→// This function implements intelligent retention by consulting the NodeProvider (if configured)\n   481→// to determine which nodes are currently in use by running jobs. Data for these nodes is\n   482→// preserved even if older than the retention time.\n   483→//\n   484→// Parameters:\n   485→//   - ms: The MemoryStore instance\n   486→//   - t: Time threshold - buffers with data older than this will be freed\n   487→//\n   488→// Returns:\n   489→//   - Number of buffers freed\n   490→//   - Error if NodeProvider query fails\n   491→//\n   492→// Behavior:\n   493→//   - If no NodeProvider is set: frees all buffers older than t\n   494→//   - If NodeProvider returns empty map: frees all buffers older than t\n   495→//   - Otherwise: preserves buffers for nodes returned by GetUsedNodes(), frees others\n   496→func Free(ms *MemoryStore, t time.Time) (int, error) {\n   497→\t// If no NodeProvider is configured, free all buffers older than t\n   498→\tif ms.nodeProvider == nil {\n   499→\t\treturn ms.Free(nil, t.Unix())\n   500→\t}\n   501→\n   502→\texcludeSelectors, err := ms.nodeProvider.GetUsedNodes(t.Unix())\n   503→\tif err != nil {\n   504→\t\treturn 0, err\n   505→\t}\n   506→\n   507→\tswitch lenMap := len(excludeSelectors); lenMap {\n   508→\n   509→\t// If the length of the map returned by GetUsedNodes() is 0,\n   510→\t// then use default Free method with nil selector\n   511→\tcase 0:\n   512→\t\tstate.selectorsExcluded = false\n   513→\t\treturn ms.Free(nil, t.Unix())\n   514→\n   515→\t// Else formulate selectors, exclude those from the map\n   516→\t// and free the rest of the selectors\n   517→\tdefault:\n   518→\t\tstate.selectorsExcluded = true\n   519→\t\tselectors := GetSelectors(ms, excludeSelectors)\n   520→\t\treturn FreeSelected(ms, selectors, t)\n   521→\t}\n   522→}\n   523→\n   524→// FreeSelected frees buffers for specific selectors while preserving others.\n   525→//\n   526→// This function is used when we want to retain some specific nodes beyond the retention time.\n   527→// It iterates through the provided selectors and frees their associated buffers.\n   528→//\n   529→// Parameters:\n   530→//   - ms: The MemoryStore instance\n   531→//   - selectors: List of selector paths to free (e.g., [[\"cluster1\", \"node1\"], [\"cluster2\", \"node2\"]])\n   532→//   - t: Time threshold for freeing buffers\n   533→//\n   534→// Returns the total number of buffers freed and any error encountered.\n   535→func FreeSelected(ms *MemoryStore, selectors [][]string, t time.Time) (int, error) {\n   536→\tfreed := 0\n   537→\n   538→\tfor _, selector := range selectors {\n   539→\n   540→\t\tfreedBuffers, err := ms.Free(selector, t.Unix())\n   541→\t\tif err != nil {\n   542→\t\t\tcclog.Errorf(\"error while freeing selected buffers: %#v\", err)\n   543→\t\t}\n   544→\t\tfreed += freedBuffers\n   545→\n   546→\t}\n   547→\n   548→\treturn freed, nil\n   549→}\n   550→\n   551→// GetSelectors returns all selectors at depth 2 (cluster/node level) that are NOT in the exclusion map.\n   552→//\n   553→// This function generates a list of selectors whose buffers should be freed by excluding\n   554→// selectors that correspond to nodes currently in use by running jobs.\n   555→//\n   556→// Parameters:\n   557→//   - ms: The MemoryStore instance\n   558→//   - excludeSelectors: Map of cluster names to node hostnames that should NOT be freed\n   559→//\n   560→// Returns a list of selectors ([]string paths) that can be safely freed.\n   561→//\n   562→// Example:\n   563→//\n   564→//\tIf the tree has paths [\"emmy\", \"node001\"] and [\"emmy\", \"node002\"],\n   565→//\tand excludeSelectors contains {\"emmy\": [\"node001\"]},\n   566→//\tthen only [[\"emmy\", \"node002\"]] is returned.\n   567→func GetSelectors(ms *MemoryStore, excludeSelectors map[string][]string) [][]string {\n   568→\tallSelectors := ms.GetPaths(2)\n   569→\n   570→\tfilteredSelectors := make([][]string, 0, len(allSelectors))\n   571→\n   572→\tfor _, path := range allSelectors {\n   573→\t\tif len(path) < 2 {\n   574→\t\t\tcontinue\n   575→\t\t}\n   576→\n   577→\t\tkey := path[0]   // The \"Key\" (Level 1)\n   578→\t\tvalue := path[1] // The \"Value\" (Level 2)\n   579→\n   580→\t\texclude := false\n   581→\n   582→\t\t// Check if the key exists in our exclusion map\n   583→\t\tif excludedValues, exists := excludeSelectors[key]; exists {\n   584→\t\t\t// The key exists, now check if the specific value is in the exclusion list\n   585→\t\t\tif slices.Contains(excludedValues, value) {\n   586→\t\t\t\texclude = true\n   587→\t\t\t}\n   588→\t\t}\n   589→\n   590→\t\tif !exclude {\n   591→\t\t\tfilteredSelectors = append(filteredSelectors, path)\n   592→\t\t}\n   593→\t}\n   594→\n   595→\treturn filteredSelectors\n   596→}\n   597→\n   598→// GetPaths returns a list of lists (paths) to the specified depth.\n   599→func (ms *MemoryStore) GetPaths(targetDepth int) [][]string {\n   600→\tvar results [][]string\n   601→\n   602→\t// Start recursion. Initial path is empty.\n   603→\t// We treat Root as depth 0.\n   604→\tms.root.collectPaths(0, targetDepth, []string{}, &results)\n   605→\n   606→\treturn results\n   607→}\n   608→\n   609→// Write all values in `metrics` to the level specified by `selector` for time `ts`.\n   610→// Look at `findLevelOrCreate` for how selectors work.\n   611→func (m *MemoryStore) Write(selector []string, ts int64, metrics []Metric) error {\n   612→\tvar ok bool\n   613→\tfor i, metric := range metrics {\n   614→\t\tif metric.MetricConfig.Frequency == 0 {\n   615→\t\t\tmetric.MetricConfig, ok = m.Metrics[metric.Name]\n   616→\t\t\tif !ok {\n   617→\t\t\t\tcclog.Debugf(\"[METRICSTORE]> Unknown metric '%s' in Write() - skipping\", metric.Name)\n   618→\t\t\t\tmetric.MetricConfig.Frequency = 0\n   619→\t\t\t}\n   620→\t\t\tmetrics[i] = metric\n   621→\t\t}\n   622→\t}\n   623→\n   624→\treturn m.WriteToLevel(&m.root, selector, ts, metrics)\n   625→}\n   626→\n   627→func (m *MemoryStore) GetLevel(selector []string) *Level {\n   628→\treturn m.root.findLevelOrCreate(selector, len(m.Metrics))\n   629→}\n   630→\n   631→// WriteToLevel assumes that `minfo` in `metrics` is filled in\n   632→func (m *MemoryStore) WriteToLevel(l *Level, selector []string, ts int64, metrics []Metric) error {\n   633→\tl = l.findLevelOrCreate(selector, len(m.Metrics))\n   634→\tl.lock.Lock()\n   635→\tdefer l.lock.Unlock()\n   636→\n   637→\tfor _, metric := range metrics {\n   638→\t\tif metric.MetricConfig.Frequency == 0 {\n   639→\t\t\tcontinue\n   640→\t\t}\n   641→\n   642→\t\tb := l.metrics[metric.MetricConfig.offset]\n   643→\t\tif b == nil {\n   644→\t\t\t// First write to this metric and level\n   645→\t\t\tb = newBuffer(ts, metric.MetricConfig.Frequency)\n   646→\t\t\tl.metrics[metric.MetricConfig.offset] = b\n   647→\t\t}\n   648→\n   649→\t\tnb, err := b.write(ts, metric.Value)\n   650→\t\tif err != nil {\n   651→\t\t\treturn err\n   652→\t\t}\n   653→\n   654→\t\t// Last write created a new buffer...\n   655→\t\tif b != nb {\n   656→\t\t\tl.metrics[metric.MetricConfig.offset] = nb\n   657→\t\t}\n   658→\t}\n   659→\treturn nil\n   660→}\n   661→\n   662→// Read returns all values for metric `metric` from `from` to `to` for the selected level(s).\n   663→// If the level does not hold the metric itself, the data will be aggregated recursively from the children.\n   664→// The second and third return value are the actual from/to for the data. Those can be different from\n   665→// the range asked for if no data was available.\n   666→func (m *MemoryStore) Read(selector util.Selector, metric string, from, to, resolution int64) ([]schema.Float, int64, int64, int64, error) {\n   667→\tif from > to {\n   668→\t\treturn nil, 0, 0, 0, errors.New(\"[METRICSTORE]> invalid time range\")\n   669→\t}\n   670→\n   671→\tminfo, ok := m.Metrics[metric]\n   672→\tif !ok {\n   673→\t\treturn nil, 0, 0, 0, errors.New(\"[METRICSTORE]> unknown metric: \" + metric)\n   674→\t}\n   675→\n   676→\tn, data := 0, make([]schema.Float, (to-from)/minfo.Frequency+1)\n   677→\n   678→\terr := m.root.findBuffers(selector, minfo.offset, func(b *buffer) error {\n   679→\t\tcdata, cfrom, cto, err := b.read(from, to, data)\n   680→\t\tif err != nil {\n   681→\t\t\treturn err\n   682→\t\t}\n   683→\n   684→\t\tif n == 0 {\n   685→\t\t\tfrom, to = cfrom, cto\n   686→\t\t} else if from != cfrom || to != cto || len(data) != len(cdata) {\n   687→\t\t\tmissingfront, missingback := int((from-cfrom)/minfo.Frequency), int((to-cto)/minfo.Frequency)\n   688→\t\t\tif missingfront != 0 {\n   689→\t\t\t\treturn ErrDataDoesNotAlign\n   690→\t\t\t}\n   691→\n   692→\t\t\tnewlen := len(cdata) - missingback\n   693→\t\t\tif newlen < 1 {\n   694→\t\t\t\treturn ErrDataDoesNotAlign\n   695→\t\t\t}\n   696→\t\t\tcdata = cdata[0:newlen]\n   697→\t\t\tif len(cdata) != len(data) {\n   698→\t\t\t\treturn ErrDataDoesNotAlign\n   699→\t\t\t}\n   700→\n   701→\t\t\tfrom, to = cfrom, cto\n   702→\t\t}\n   703→\n   704→\t\tdata = cdata\n   705→\t\tn += 1\n   706→\t\treturn nil\n   707→\t})\n   708→\n   709→\tif err != nil {\n   710→\t\treturn nil, 0, 0, 0, err\n   711→\t} else if n == 0 {\n   712→\t\treturn nil, 0, 0, 0, ErrNoHostOrMetric\n   713→\t} else if n > 1 {\n   714→\t\tif minfo.Aggregation == AvgAggregation {\n   715→\t\t\tnormalize := 1. / schema.Float(n)\n   716→\t\t\tfor i := 0; i < len(data); i++ {\n   717→\t\t\t\tdata[i] *= normalize\n   718→\t\t\t}\n   719→\t\t} else if minfo.Aggregation != SumAggregation {\n   720→\t\t\treturn nil, 0, 0, 0, errors.New(\"[METRICSTORE]> invalid aggregation\")\n   721→\t\t}\n   722→\t}\n   723→\n   724→\tdata, resolution, err = resampler.LargestTriangleThreeBucket(data, minfo.Frequency, resolution)\n   725→\tif err != nil {\n   726→\t\treturn nil, 0, 0, 0, err\n   727→\t}\n   728→\n   729→\treturn data, from, to, resolution, nil\n   730→}\n   731→\n   732→// Free releases all buffers for the selected level and all its children that\n   733→// contain only values older than `t`.\n   734→func (m *MemoryStore) Free(selector []string, t int64) (int, error) {\n   735→\treturn m.GetLevel(selector).free(t)\n   736→}\n   737→\n   738→// ForceFree unconditionally removes the oldest buffer from each metric chain.\n   739→func (m *MemoryStore) ForceFree() (int, error) {\n   740→\treturn m.GetLevel(nil).forceFree()\n   741→}\n   742→\n   743→func (m *MemoryStore) FreeAll() error {\n   744→\tfor k := range m.root.children {\n   745→\t\tdelete(m.root.children, k)\n   746→\t}\n   747→\n   748→\treturn nil\n   749→}\n   750→\n   751→func (m *MemoryStore) SizeInBytes() int64 {\n   752→\treturn m.root.sizeInBytes()\n   753→}\n   754→\n   755→func (m *MemoryStore) SizeInGB() float64 {\n   756→\treturn float64(m.root.sizeInBytes()) / 1e9\n   757→}\n   758→\n   759→// ListChildren , given a selector, returns a list of all children of the level\n   760→// selected.\n   761→func (m *MemoryStore) ListChildren(selector []string) []string {\n   762→\tlvl := &m.root\n   763→\tfor lvl != nil && len(selector) != 0 {\n   764→\t\tlvl.lock.RLock()\n   765→\t\tnext := lvl.children[selector[0]]\n   766→\t\tlvl.lock.RUnlock()\n   767→\t\tlvl = next\n   768→\t\tselector = selector[1:]\n   769→\t}\n   770→\n   771→\tif lvl == nil {\n   772→\t\treturn nil\n   773→\t}\n   774→\n   775→\tlvl.lock.RLock()\n   776→\tdefer lvl.lock.RUnlock()\n   777→\n   778→\tchildren := make([]string, 0, len(lvl.children))\n   779→\tfor child := range lvl.children {\n   780→\t\tchildren = append(children, child)\n   781→\t}\n   782→\n   783→\treturn children\n   784→}\n   785→"}]},"uuid":"1e97e603-6306-434d-88ff-d1a464ec2fd7","timestamp":"2026-03-13T06:51:38.364Z","toolUseResult":{"type":"text","file":{"filePath":"/Users/jan/prg/ClusterCockpit/cc-backend/pkg/metricstore/metricstore.go","content":"// Copyright (C) NHR@FAU, University Erlangen-Nuremberg.\n// All rights reserved. This file is part of cc-backend.\n// Use of this source code is governed by a MIT-style\n// license that can be found in the LICENSE file.\n\n// Package metricstore provides an efficient in-memory time-series metric storage system\n// with support for hierarchical data organization, checkpointing, and archiving.\n//\n// The package organizes metrics in a tree structure (cluster → host → component) and\n// provides concurrent read/write access to metric data with configurable aggregation strategies.\n// Background goroutines handle periodic checkpointing (JSON or Avro format), archiving old data,\n// and enforcing retention policies.\n//\n// Key features:\n//   - In-memory metric storage with configurable retention\n//   - Hierarchical data organization (selectors)\n//   - Concurrent checkpoint/archive workers\n//   - Support for sum and average aggregation\n//   - NATS integration for metric ingestion\npackage metricstore\n\nimport (\n\t\"bytes\"\n\t\"context\"\n\t\"encoding/json\"\n\t\"errors\"\n\t\"fmt\"\n\t\"runtime\"\n\t\"runtime/debug\"\n\t\"slices\"\n\t\"sync\"\n\t\"time\"\n\n\t\"github.com/ClusterCockpit/cc-backend/internal/config\"\n\tcclog \"github.com/ClusterCockpit/cc-lib/v2/ccLogger\"\n\t\"github.com/ClusterCockpit/cc-lib/v2/resampler\"\n\t\"github.com/ClusterCockpit/cc-lib/v2/schema\"\n\t\"github.com/ClusterCockpit/cc-lib/v2/util\"\n)\n\n// GlobalState holds the global state for the metric store with thread-safe access.\ntype GlobalState struct {\n\tmu                sync.RWMutex\n\tlastRetentionTime int64\n\tselectorsExcluded bool\n}\n\nvar (\n\tsingleton  sync.Once\n\tmsInstance *MemoryStore\n\t// shutdownFunc stores the context cancellation function created in Init\n\t// and is called during Shutdown to cancel all background goroutines\n\tshutdownFunc   context.CancelFunc\n\tshutdownFuncMu sync.Mutex // Protects shutdownFunc from concurrent access\n\t// Create a global instance\n\tstate = &GlobalState{}\n)\n\n// NodeProvider provides information about nodes currently in use by running jobs.\n//\n// This interface allows metricstore to query job information without directly\n// depending on the repository package, breaking the import cycle.\n//\n// Implementations should return nodes that are actively processing jobs started\n// before the given timestamp. These nodes will be excluded from retention-based\n// garbage collection to prevent data loss for jobs that are still running or\n// recently completed.\ntype NodeProvider interface {\n\t// GetUsedNodes returns a map of cluster names to sorted lists of unique hostnames\n\t// that are currently in use by jobs that started before the given timestamp.\n\t//\n\t// Parameters:\n\t//   - ts: Unix timestamp threshold - returns nodes with jobs started before this time\n\t//\n\t// Returns:\n\t//   - Map of cluster names to lists of node hostnames that should be excluded from garbage collection\n\t//   - Error if the query fails\n\tGetUsedNodes(ts int64) (map[string][]string, error)\n}\n\n// Metric represents a single metric data point to be written to the store.\ntype Metric struct {\n\tName  string\n\tValue schema.Float\n\t// MetricConfig contains frequency and aggregation settings for this metric.\n\t// If Frequency is 0, configuration will be looked up from MemoryStore.Metrics during Write().\n\tMetricConfig MetricConfig\n}\n\n// MemoryStore is the main in-memory time-series metric storage implementation.\n//\n// It organizes metrics in a hierarchical tree structure where each level represents\n// a component of the system hierarchy (e.g., cluster → host → CPU). Each level can\n// store multiple metrics as time-series buffers.\n//\n// The store is initialized as a singleton via InitMetrics() and accessed via GetMemoryStore().\n// All public methods are safe for concurrent use.\ntype MemoryStore struct {\n\tMetrics      map[string]MetricConfig\n\troot         Level\n\tnodeProvider NodeProvider\n}\n\n// Init initializes the metric store from configuration and starts background workers.\n//\n// This function must be called exactly once before any other metricstore operations.\n// It performs the following initialization steps:\n//  1. Validates and decodes the metric store configuration\n//  2. Configures worker pool size (defaults to NumCPU/2+1, max 10)\n//  3. Loads metric configurations from all registered clusters\n//  4. Restores checkpoints within the retention window\n//  5. Starts background workers for retention, checkpointing, archiving, and monitoring\n//  6. Optionally subscribes to NATS for real-time metric ingestion\n//\n// Parameters:\n//   - rawConfig: JSON configuration for the metric store (see MetricStoreConfig)\n//   - wg: WaitGroup that will be incremented for each background goroutine started\n//\n// The function will call cclog.Fatal on critical errors during initialization.\n// Use Shutdown() to cleanly stop all background workers started by Init().\n//\n// Note: Signal handling must be implemented by the caller. Call Shutdown() when\n// receiving termination signals to ensure checkpoint data is persisted.\nfunc Init(rawConfig json.RawMessage, metrics map[string]MetricConfig, wg *sync.WaitGroup) {\n\tstartupTime := time.Now()\n\n\tif rawConfig != nil {\n\t\tconfig.Validate(configSchema, rawConfig)\n\t\tdec := json.NewDecoder(bytes.NewReader(rawConfig))\n\t\tdec.DisallowUnknownFields()\n\t\tif err := dec.Decode(&Keys); err != nil {\n\t\t\tcclog.Abortf(\"[METRICSTORE]> Metric Store Config Init: Could not decode config file '%s'.\\nError: %s\\n\", rawConfig, err.Error())\n\t\t}\n\t}\n\n\t// Set NumWorkers from config or use default\n\tif Keys.NumWorkers <= 0 {\n\t\tKeys.NumWorkers = min(runtime.NumCPU()/2+1, DefaultMaxWorkers)\n\t}\n\tcclog.Debugf(\"[METRICSTORE]> Using %d workers for checkpoint/archive operations\\n\", Keys.NumWorkers)\n\n\t// Pass the config.MetricStoreKeys\n\tInitMetrics(metrics)\n\n\tms := GetMemoryStore()\n\n\td, err := time.ParseDuration(Keys.RetentionInMemory)\n\tif err != nil {\n\t\tcclog.Fatal(err)\n\t}\n\n\trestoreFrom := startupTime.Add(-d)\n\tcclog.Infof(\"[METRICSTORE]> Loading checkpoints newer than %s\\n\", restoreFrom.Format(time.RFC3339))\n\tfiles, err := ms.FromCheckpointFiles(Keys.Checkpoints.RootDir, restoreFrom.Unix())\n\tloadedData := ms.SizeInBytes() / 1024 / 1024 // In MB\n\tif err != nil {\n\t\tcclog.Fatalf(\"[METRICSTORE]> Loading checkpoints failed: %s\\n\", err.Error())\n\t} else {\n\t\tcclog.Infof(\"[METRICSTORE]> Checkpoints loaded (%d files, %d MB, that took %fs)\\n\", files, loadedData, time.Since(startupTime).Seconds())\n\t}\n\n\t// Try to use less memory by forcing a GC run here and then\n\t// lowering the target percentage. The default of 100 means\n\t// that only once the ratio of new allocations execeds the\n\t// previously active heap, a GC is triggered.\n\t// Forcing a GC here will set the \"previously active heap\"\n\t// to a minumum.\n\t// runtime.GC()\n\n\tctx, shutdown := context.WithCancel(context.Background())\n\n\tRetention(wg, ctx)\n\tCheckpointing(wg, ctx)\n\tCleanUp(wg, ctx)\n\tWALStaging(wg, ctx)\n\tMemoryUsageTracker(wg, ctx)\n\n\t// Note: Signal handling has been removed from this function.\n\t// The caller is responsible for handling shutdown signals and calling\n\t// the shutdown() function when appropriate.\n\t// Store the shutdown function for later use by Shutdown()\n\tshutdownFuncMu.Lock()\n\tshutdownFunc = shutdown\n\tshutdownFuncMu.Unlock()\n\n\tif Keys.Subscriptions != nil {\n\t\terr = ReceiveNats(ms, 1, ctx)\n\t\tif err != nil {\n\t\t\tcclog.Fatal(err)\n\t\t}\n\t}\n}\n\n// InitMetrics initializes the singleton MemoryStore instance with the given metric configurations.\n//\n// This function must be called before GetMemoryStore() and can only be called once due to\n// the singleton pattern. It assigns each metric an internal offset for efficient buffer indexing.\n//\n// Parameters:\n//   - metrics: Map of metric names to their configurations (frequency and aggregation strategy)\n//\n// Panics if any metric has Frequency == 0, which indicates an invalid configuration.\n//\n// After this call, the global msInstance is ready for use via GetMemoryStore().\nfunc InitMetrics(metrics map[string]MetricConfig) {\n\tsingleton.Do(func() {\n\t\toffset := 0\n\t\tfor key, cfg := range metrics {\n\t\t\tif cfg.Frequency == 0 {\n\t\t\t\tpanic(\"[METRICSTORE]> invalid frequency\")\n\t\t\t}\n\n\t\t\tmetrics[key] = MetricConfig{\n\t\t\t\tFrequency:   cfg.Frequency,\n\t\t\t\tAggregation: cfg.Aggregation,\n\t\t\t\toffset:      offset,\n\t\t\t}\n\t\t\toffset += 1\n\t\t}\n\n\t\tmsInstance = &MemoryStore{\n\t\t\troot: Level{\n\t\t\t\tmetrics:  make([]*buffer, len(metrics)),\n\t\t\t\tchildren: make(map[string]*Level),\n\t\t\t},\n\t\t\tMetrics: metrics,\n\t\t}\n\t})\n}\n\n// GetMemoryStore returns the singleton MemoryStore instance.\n//\n// Returns the initialized MemoryStore singleton. Calls cclog.Fatal if InitMetrics() was not called first.\n//\n// This function is safe for concurrent use after initialization.\nfunc GetMemoryStore() *MemoryStore {\n\tif msInstance == nil {\n\t\tcclog.Warnf(\"[METRICSTORE]> MemoryStore not initialized!\")\n\t}\n\n\treturn msInstance\n}\n\nfunc (ms *MemoryStore) GetMetricFrequency(metricName string) (int64, error) {\n\tif metric, ok := ms.Metrics[metricName]; ok {\n\t\treturn metric.Frequency, nil\n\t}\n\treturn 0, fmt.Errorf(\"[METRICSTORE]> metric %s not found\", metricName)\n}\n\n// SetNodeProvider sets the NodeProvider implementation for the MemoryStore.\n// This must be called during initialization to provide job state information\n// for selective buffer retention during Free operations.\n// If not set, the Free function will fall back to freeing all buffers.\nfunc (ms *MemoryStore) SetNodeProvider(provider NodeProvider) {\n\tms.nodeProvider = provider\n}\n\n// Shutdown performs a graceful shutdown of the metric store.\n//\n// This function cancels all background goroutines started by Init() and writes\n// a final checkpoint to disk before returning. It should be called when the\n// application receives a termination signal.\n//\n// The function will:\n//  1. Cancel the context to stop all background workers\n//  2. Close the WAL messages channel if using WAL format\n//  3. Write a final checkpoint to preserve in-memory data\n//  4. Log any errors encountered during shutdown\n//\n// Note: This function blocks until the final checkpoint is written.\nfunc Shutdown() {\n\tshutdownFuncMu.Lock()\n\tdefer shutdownFuncMu.Unlock()\n\tif shutdownFunc != nil {\n\t\tshutdownFunc()\n\t}\n\n\tif Keys.Checkpoints.FileFormat == \"wal\" {\n\t\tclose(WALMessages)\n\t}\n\n\tcclog.Infof(\"[METRICSTORE]> Writing to '%s'...\\n\", Keys.Checkpoints.RootDir)\n\tvar files int\n\tvar err error\n\n\tms := GetMemoryStore()\n\n\tlastCheckpointMu.Lock()\n\tfrom := lastCheckpoint\n\tlastCheckpointMu.Unlock()\n\n\tif Keys.Checkpoints.FileFormat == \"wal\" {\n\t\tvar hostDirs []string\n\t\tfiles, hostDirs, err = ms.ToCheckpointWAL(Keys.Checkpoints.RootDir, from.Unix(), time.Now().Unix())\n\t\tif err == nil {\n\t\t\tRotateWALFilesAfterShutdown(hostDirs)\n\t\t}\n\t} else {\n\t\tfiles, err = ms.ToCheckpoint(Keys.Checkpoints.RootDir, from.Unix(), time.Now().Unix())\n\t}\n\n\tif err != nil {\n\t\tcclog.Errorf(\"[METRICSTORE]> Writing checkpoint failed: %s\\n\", err.Error())\n\t}\n\tcclog.Infof(\"[METRICSTORE]> Done! (%d files written)\\n\", files)\n}\n\n// Retention starts a background goroutine that periodically frees old metric data.\n//\n// This worker runs at half the retention interval and calls Free() to remove buffers\n// older than the configured retention time. It respects the NodeProvider to preserve\n// data for nodes with active jobs.\n//\n// Parameters:\n//   - wg: WaitGroup to signal completion when context is cancelled\n//   - ctx: Context for cancellation signal\n//\n// The goroutine exits when ctx is cancelled.\nfunc Retention(wg *sync.WaitGroup, ctx context.Context) {\n\tms := GetMemoryStore()\n\n\twg.Go(func() {\n\t\td, err := time.ParseDuration(Keys.RetentionInMemory)\n\t\tif err != nil {\n\t\t\tcclog.Fatal(err)\n\t\t}\n\t\tif d <= 0 {\n\t\t\treturn\n\t\t}\n\n\t\ttickInterval := d / 2\n\t\tif tickInterval <= 0 {\n\t\t\treturn\n\t\t}\n\t\tticker := time.NewTicker(tickInterval)\n\t\tdefer ticker.Stop()\n\n\t\tfor {\n\t\t\tselect {\n\t\t\tcase <-ctx.Done():\n\t\t\t\treturn\n\t\t\tcase <-ticker.C:\n\t\t\t\tstate.mu.Lock()\n\n\t\t\t\tt := time.Now().Add(-d)\n\n\t\t\t\tstate.lastRetentionTime = t.Unix()\n\n\t\t\t\tcclog.Infof(\"[METRICSTORE]> start freeing buffers (older than %s)...\\n\", t.Format(time.RFC3339))\n\n\t\t\t\tfreed, err := Free(ms, t)\n\t\t\t\tif err != nil {\n\t\t\t\t\tcclog.Errorf(\"[METRICSTORE]> freeing up buffers failed: %s\\n\", err.Error())\n\t\t\t\t} else {\n\t\t\t\t\tcclog.Infof(\"[METRICSTORE]> done: %d buffers freed\\n\", freed)\n\t\t\t\t}\n\n\t\t\t\tstate.mu.Unlock()\n\n\t\t\t\t// Clean up the buffer pool\n\t\t\t\tbufferPool.Clean(state.lastRetentionTime)\n\t\t\t}\n\t\t}\n\t})\n}\n\n// MemoryUsageTracker starts a background goroutine that monitors memory usage.\n//\n// This worker checks actual process memory usage (via runtime.MemStats) periodically\n// and force-frees buffers if memory exceeds the configured cap. It uses FreeOSMemory()\n// to return memory to the OS after freeing buffers, avoiding aggressive GC that causes\n// performance issues.\n//\n// The tracker logs both actual memory usage (heap allocated) and metric data size for\n// visibility into memory overhead from Go runtime structures and allocations.\n//\n// Parameters:\n//   - wg: WaitGroup to signal completion when context is cancelled\n//   - ctx: Context for cancellation signal\n//\n// The goroutine exits when ctx is cancelled.\nfunc MemoryUsageTracker(wg *sync.WaitGroup, ctx context.Context) {\n\tms := GetMemoryStore()\n\n\twg.Go(func() {\n\t\td := DefaultMemoryUsageTrackerInterval\n\n\t\tif d <= 0 {\n\t\t\treturn\n\t\t}\n\n\t\tticker := time.NewTicker(d)\n\t\tdefer ticker.Stop()\n\n\t\tfor {\n\t\t\tselect {\n\t\t\tcase <-ctx.Done():\n\t\t\t\treturn\n\t\t\tcase <-ticker.C:\n\t\t\t\tvar mem runtime.MemStats\n\t\t\t\truntime.ReadMemStats(&mem)\n\t\t\t\tactualMemoryGB := float64(mem.Alloc) / 1e9\n\t\t\t\tmetricDataGB := ms.SizeInGB()\n\t\t\t\tcclog.Infof(\"[METRICSTORE]> memory usage: %.2f GB actual (%.2f GB metric data)\", actualMemoryGB, metricDataGB)\n\n\t\t\t\tfreedExcluded := 0\n\t\t\t\tfreedEmergency := 0\n\t\t\t\tvar err error\n\n\t\t\t\tstate.mu.RLock()\n\t\t\t\tlastRetention := state.lastRetentionTime\n\t\t\t\tselectorsExcluded := state.selectorsExcluded\n\t\t\t\tstate.mu.RUnlock()\n\n\t\t\t\tif lastRetention != 0 && selectorsExcluded {\n\t\t\t\t\tfreedExcluded, err = ms.Free(nil, lastRetention)\n\t\t\t\t\tif err != nil {\n\t\t\t\t\t\tcclog.Errorf(\"[METRICSTORE]> error while force-freeing the excluded buffers: %s\", err)\n\t\t\t\t\t}\n\n\t\t\t\t\tif freedExcluded > 0 {\n\t\t\t\t\t\tdebug.FreeOSMemory()\n\t\t\t\t\t\tcclog.Infof(\"[METRICSTORE]> done: %d excluded buffers force-freed\", freedExcluded)\n\t\t\t\t\t}\n\t\t\t\t}\n\n\t\t\t\truntime.ReadMemStats(&mem)\n\t\t\t\tactualMemoryGB = float64(mem.Alloc) / 1e9\n\n\t\t\t\tbufferPool.Clear()\n\t\t\t\tcclog.Infof(\"[METRICSTORE]> Cleaned up bufferPool\\n\")\n\n\t\t\t\tif actualMemoryGB > float64(Keys.MemoryCap) {\n\t\t\t\t\tcclog.Warnf(\"[METRICSTORE]> memory usage %.2f GB exceeds cap %d GB, starting emergency buffer freeing\", actualMemoryGB, Keys.MemoryCap)\n\n\t\t\t\t\tconst maxIterations = 100\n\n\t\t\t\t\tfor i := range maxIterations {\n\t\t\t\t\t\tif actualMemoryGB < float64(Keys.MemoryCap) {\n\t\t\t\t\t\t\tbreak\n\t\t\t\t\t\t}\n\n\t\t\t\t\t\tfreed, err := ms.ForceFree()\n\t\t\t\t\t\tif err != nil {\n\t\t\t\t\t\t\tcclog.Errorf(\"[METRICSTORE]> error while force-freeing buffers: %s\", err)\n\t\t\t\t\t\t}\n\t\t\t\t\t\tif freed == 0 {\n\t\t\t\t\t\t\tcclog.Errorf(\"[METRICSTORE]> no more buffers to free after %d emergency frees, memory usage %.2f GB still exceeds cap %d GB\", freedEmergency, actualMemoryGB, Keys.MemoryCap)\n\t\t\t\t\t\t\tbreak\n\t\t\t\t\t\t}\n\t\t\t\t\t\tfreedEmergency += freed\n\n\t\t\t\t\t\tif i%10 == 0 && freedEmergency > 0 {\n\t\t\t\t\t\t\truntime.ReadMemStats(&mem)\n\t\t\t\t\t\t\tactualMemoryGB = float64(mem.Alloc) / 1e9\n\t\t\t\t\t\t}\n\t\t\t\t\t}\n\n\t\t\t\t\t// if freedEmergency > 0 {\n\t\t\t\t\t// \tdebug.FreeOSMemory()\n\t\t\t\t\t// }\n\n\t\t\t\t\truntime.ReadMemStats(&mem)\n\t\t\t\t\tactualMemoryGB = float64(mem.Alloc) / 1e9\n\n\t\t\t\t\tif actualMemoryGB >= float64(Keys.MemoryCap) {\n\t\t\t\t\t\tcclog.Errorf(\"[METRICSTORE]> after %d emergency frees, memory usage %.2f GB still at/above cap %d GB\", freedEmergency, actualMemoryGB, Keys.MemoryCap)\n\t\t\t\t\t} else {\n\t\t\t\t\t\tcclog.Infof(\"[METRICSTORE]> emergency freeing complete: %d buffers freed, memory now %.2f GB\", freedEmergency, actualMemoryGB)\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t})\n}\n\n// Free removes metric data older than the given time while preserving data for active nodes.\n//\n// This function implements intelligent retention by consulting the NodeProvider (if configured)\n// to determine which nodes are currently in use by running jobs. Data for these nodes is\n// preserved even if older than the retention time.\n//\n// Parameters:\n//   - ms: The MemoryStore instance\n//   - t: Time threshold - buffers with data older than this will be freed\n//\n// Returns:\n//   - Number of buffers freed\n//   - Error if NodeProvider query fails\n//\n// Behavior:\n//   - If no NodeProvider is set: frees all buffers older than t\n//   - If NodeProvider returns empty map: frees all buffers older than t\n//   - Otherwise: preserves buffers for nodes returned by GetUsedNodes(), frees others\nfunc Free(ms *MemoryStore, t time.Time) (int, error) {\n\t// If no NodeProvider is configured, free all buffers older than t\n\tif ms.nodeProvider == nil {\n\t\treturn ms.Free(nil, t.Unix())\n\t}\n\n\texcludeSelectors, err := ms.nodeProvider.GetUsedNodes(t.Unix())\n\tif err != nil {\n\t\treturn 0, err\n\t}\n\n\tswitch lenMap := len(excludeSelectors); lenMap {\n\n\t// If the length of the map returned by GetUsedNodes() is 0,\n\t// then use default Free method with nil selector\n\tcase 0:\n\t\tstate.selectorsExcluded = false\n\t\treturn ms.Free(nil, t.Unix())\n\n\t// Else formulate selectors, exclude those from the map\n\t// and free the rest of the selectors\n\tdefault:\n\t\tstate.selectorsExcluded = true\n\t\tselectors := GetSelectors(ms, excludeSelectors)\n\t\treturn FreeSelected(ms, selectors, t)\n\t}\n}\n\n// FreeSelected frees buffers for specific selectors while preserving others.\n//\n// This function is used when we want to retain some specific nodes beyond the retention time.\n// It iterates through the provided selectors and frees their associated buffers.\n//\n// Parameters:\n//   - ms: The MemoryStore instance\n//   - selectors: List of selector paths to free (e.g., [[\"cluster1\", \"node1\"], [\"cluster2\", \"node2\"]])\n//   - t: Time threshold for freeing buffers\n//\n// Returns the total number of buffers freed and any error encountered.\nfunc FreeSelected(ms *MemoryStore, selectors [][]string, t time.Time) (int, error) {\n\tfreed := 0\n\n\tfor _, selector := range selectors {\n\n\t\tfreedBuffers, err := ms.Free(selector, t.Unix())\n\t\tif err != nil {\n\t\t\tcclog.Errorf(\"error while freeing selected buffers: %#v\", err)\n\t\t}\n\t\tfreed += freedBuffers\n\n\t}\n\n\treturn freed, nil\n}\n\n// GetSelectors returns all selectors at depth 2 (cluster/node level) that are NOT in the exclusion map.\n//\n// This function generates a list of selectors whose buffers should be freed by excluding\n// selectors that correspond to nodes currently in use by running jobs.\n//\n// Parameters:\n//   - ms: The MemoryStore instance\n//   - excludeSelectors: Map of cluster names to node hostnames that should NOT be freed\n//\n// Returns a list of selectors ([]string paths) that can be safely freed.\n//\n// Example:\n//\n//\tIf the tree has paths [\"emmy\", \"node001\"] and [\"emmy\", \"node002\"],\n//\tand excludeSelectors contains {\"emmy\": [\"node001\"]},\n//\tthen only [[\"emmy\", \"node002\"]] is returned.\nfunc GetSelectors(ms *MemoryStore, excludeSelectors map[string][]string) [][]string {\n\tallSelectors := ms.GetPaths(2)\n\n\tfilteredSelectors := make([][]string, 0, len(allSelectors))\n\n\tfor _, path := range allSelectors {\n\t\tif len(path) < 2 {\n\t\t\tcontinue\n\t\t}\n\n\t\tkey := path[0]   // The \"Key\" (Level 1)\n\t\tvalue := path[1] // The \"Value\" (Level 2)\n\n\t\texclude := false\n\n\t\t// Check if the key exists in our exclusion map\n\t\tif excludedValues, exists := excludeSelectors[key]; exists {\n\t\t\t// The key exists, now check if the specific value is in the exclusion list\n\t\t\tif slices.Contains(excludedValues, value) {\n\t\t\t\texclude = true\n\t\t\t}\n\t\t}\n\n\t\tif !exclude {\n\t\t\tfilteredSelectors = append(filteredSelectors, path)\n\t\t}\n\t}\n\n\treturn filteredSelectors\n}\n\n// GetPaths returns a list of lists (paths) to the specified depth.\nfunc (ms *MemoryStore) GetPaths(targetDepth int) [][]string {\n\tvar results [][]string\n\n\t// Start recursion. Initial path is empty.\n\t// We treat Root as depth 0.\n\tms.root.collectPaths(0, targetDepth, []string{}, &results)\n\n\treturn results\n}\n\n// Write all values in `metrics` to the level specified by `selector` for time `ts`.\n// Look at `findLevelOrCreate` for how selectors work.\nfunc (m *MemoryStore) Write(selector []string, ts int64, metrics []Metric) error {\n\tvar ok bool\n\tfor i, metric := range metrics {\n\t\tif metric.MetricConfig.Frequency == 0 {\n\t\t\tmetric.MetricConfig, ok = m.Metrics[metric.Name]\n\t\t\tif !ok {\n\t\t\t\tcclog.Debugf(\"[METRICSTORE]> Unknown metric '%s' in Write() - skipping\", metric.Name)\n\t\t\t\tmetric.MetricConfig.Frequency = 0\n\t\t\t}\n\t\t\tmetrics[i] = metric\n\t\t}\n\t}\n\n\treturn m.WriteToLevel(&m.root, selector, ts, metrics)\n}\n\nfunc (m *MemoryStore) GetLevel(selector []string) *Level {\n\treturn m.root.findLevelOrCreate(selector, len(m.Metrics))\n}\n\n// WriteToLevel assumes that `minfo` in `metrics` is filled in\nfunc (m *MemoryStore) WriteToLevel(l *Level, selector []string, ts int64, metrics []Metric) error {\n\tl = l.findLevelOrCreate(selector, len(m.Metrics))\n\tl.lock.Lock()\n\tdefer l.lock.Unlock()\n\n\tfor _, metric := range metrics {\n\t\tif metric.MetricConfig.Frequency == 0 {\n\t\t\tcontinue\n\t\t}\n\n\t\tb := l.metrics[metric.MetricConfig.offset]\n\t\tif b == nil {\n\t\t\t// First write to this metric and level\n\t\t\tb = newBuffer(ts, metric.MetricConfig.Frequency)\n\t\t\tl.metrics[metric.MetricConfig.offset] = b\n\t\t}\n\n\t\tnb, err := b.write(ts, metric.Value)\n\t\tif err != nil {\n\t\t\treturn err\n\t\t}\n\n\t\t// Last write created a new buffer...\n\t\tif b != nb {\n\t\t\tl.metrics[metric.MetricConfig.offset] = nb\n\t\t}\n\t}\n\treturn nil\n}\n\n// Read returns all values for metric `metric` from `from` to `to` for the selected level(s).\n// If the level does not hold the metric itself, the data will be aggregated recursively from the children.\n// The second and third return value are the actual from/to for the data. Those can be different from\n// the range asked for if no data was available.\nfunc (m *MemoryStore) Read(selector util.Selector, metric string, from, to, resolution int64) ([]schema.Float, int64, int64, int64, error) {\n\tif from > to {\n\t\treturn nil, 0, 0, 0, errors.New(\"[METRICSTORE]> invalid time range\")\n\t}\n\n\tminfo, ok := m.Metrics[metric]\n\tif !ok {\n\t\treturn nil, 0, 0, 0, errors.New(\"[METRICSTORE]> unknown metric: \" + metric)\n\t}\n\n\tn, data := 0, make([]schema.Float, (to-from)/minfo.Frequency+1)\n\n\terr := m.root.findBuffers(selector, minfo.offset, func(b *buffer) error {\n\t\tcdata, cfrom, cto, err := b.read(from, to, data)\n\t\tif err != nil {\n\t\t\treturn err\n\t\t}\n\n\t\tif n == 0 {\n\t\t\tfrom, to = cfrom, cto\n\t\t} else if from != cfrom || to != cto || len(data) != len(cdata) {\n\t\t\tmissingfront, missingback := int((from-cfrom)/minfo.Frequency), int((to-cto)/minfo.Frequency)\n\t\t\tif missingfront != 0 {\n\t\t\t\treturn ErrDataDoesNotAlign\n\t\t\t}\n\n\t\t\tnewlen := len(cdata) - missingback\n\t\t\tif newlen < 1 {\n\t\t\t\treturn ErrDataDoesNotAlign\n\t\t\t}\n\t\t\tcdata = cdata[0:newlen]\n\t\t\tif len(cdata) != len(data) {\n\t\t\t\treturn ErrDataDoesNotAlign\n\t\t\t}\n\n\t\t\tfrom, to = cfrom, cto\n\t\t}\n\n\t\tdata = cdata\n\t\tn += 1\n\t\treturn nil\n\t})\n\n\tif err != nil {\n\t\treturn nil, 0, 0, 0, err\n\t} else if n == 0 {\n\t\treturn nil, 0, 0, 0, ErrNoHostOrMetric\n\t} else if n > 1 {\n\t\tif minfo.Aggregation == AvgAggregation {\n\t\t\tnormalize := 1. / schema.Float(n)\n\t\t\tfor i := 0; i < len(data); i++ {\n\t\t\t\tdata[i] *= normalize\n\t\t\t}\n\t\t} else if minfo.Aggregation != SumAggregation {\n\t\t\treturn nil, 0, 0, 0, errors.New(\"[METRICSTORE]> invalid aggregation\")\n\t\t}\n\t}\n\n\tdata, resolution, err = resampler.LargestTriangleThreeBucket(data, minfo.Frequency, resolution)\n\tif err != nil {\n\t\treturn nil, 0, 0, 0, err\n\t}\n\n\treturn data, from, to, resolution, nil\n}\n\n// Free releases all buffers for the selected level and all its children that\n// contain only values older than `t`.\nfunc (m *MemoryStore) Free(selector []string, t int64) (int, error) {\n\treturn m.GetLevel(selector).free(t)\n}\n\n// ForceFree unconditionally removes the oldest buffer from each metric chain.\nfunc (m *MemoryStore) ForceFree() (int, error) {\n\treturn m.GetLevel(nil).forceFree()\n}\n\nfunc (m *MemoryStore) FreeAll() error {\n\tfor k := range m.root.children {\n\t\tdelete(m.root.children, k)\n\t}\n\n\treturn nil\n}\n\nfunc (m *MemoryStore) SizeInBytes() int64 {\n\treturn m.root.sizeInBytes()\n}\n\nfunc (m *MemoryStore) SizeInGB() float64 {\n\treturn float64(m.root.sizeInBytes()) / 1e9\n}\n\n// ListChildren , given a selector, returns a list of all children of the level\n// selected.\nfunc (m *MemoryStore) ListChildren(selector []string) []string {\n\tlvl := &m.root\n\tfor lvl != nil && len(selector) != 0 {\n\t\tlvl.lock.RLock()\n\t\tnext := lvl.children[selector[0]]\n\t\tlvl.lock.RUnlock()\n\t\tlvl = next\n\t\tselector = selector[1:]\n\t}\n\n\tif lvl == nil {\n\t\treturn nil\n\t}\n\n\tlvl.lock.RLock()\n\tdefer lvl.lock.RUnlock()\n\n\tchildren := make([]string, 0, len(lvl.children))\n\tfor child := range lvl.children {\n\t\tchildren = append(children, child)\n\t}\n\n\treturn children\n}\n","numLines":785,"startLine":1,"totalLines":785}},"sourceToolAssistantUUID":"d8d1a8d8-96b7-4919-bcc6-949d23a60249","userType":"external","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"39705f8c-1691-4d60-b0aa-39f588ed9dcf","version":"2.1.74","gitBranch":"hotfix","slug":"linear-roaming-glade"}
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{"parentUuid":"02aaffa4-66f2-4db0-999f-096c2db78c1f","isSidechain":false,"promptId":"a631224c-8362-4377-bee6-9ff6c4b66c68","type":"user","message":{"role":"user","content":[{"tool_use_id":"toolu_01Qikk7RHmQ5aCygqQ29aHUQ","type":"tool_result","content":"     1→// Copyright (C) NHR@FAU, University Erlangen-Nuremberg.\n     2→// All rights reserved. This file is part of cc-backend.\n     3→// Use of this source code is governed by a MIT-style\n     4→// license that can be found in the LICENSE file.\n     5→\n     6→// Package metricstore provides config.go: Configuration structures and metric management.\n     7→//\n     8→// # Configuration Hierarchy\n     9→//\n    10→// The metricstore package uses nested configuration structures:\n    11→//\n    12→//\tMetricStoreConfig (Keys)\n    13→//\t├─ NumWorkers: Parallel checkpoint/archive workers\n    14→//\t├─ RetentionInMemory: How long to keep data in RAM (also used as cleanup interval)\n    15→//\t├─ MemoryCap: Memory limit in bytes (triggers forceFree)\n    16→//\t├─ Checkpoints: Persistence configuration\n    17→//\t│  ├─ FileFormat: \"json\" or \"wal\" (default: \"wal\")\n    18→//\t│  └─ RootDir: Checkpoint storage path\n    19→//\t├─ Cleanup: Long-term storage configuration (interval = RetentionInMemory)\n    20→//\t│  ├─ RootDir: Archive storage path (archive mode only)\n    21→//\t│  └─ Mode: \"delete\" or \"archive\"\n    22→//\t├─ Debug: Development/debugging options\n    23→//\t└─ Subscriptions: NATS topic subscriptions for metric ingestion\n    24→//\n    25→// # Metric Configuration\n    26→//\n    27→// Each metric (e.g., \"cpu_load\", \"mem_used\") has a MetricConfig entry in the global\n    28→// Metrics map, defining:\n    29→//\n    30→//   - Frequency: Measurement interval in seconds\n    31→//   - Aggregation: How to combine values (sum/avg/none) when transforming scopes\n    32→//   - offset: Internal index into Level.metrics slice (assigned during Init)\n    33→//\n    34→// # AggregationStrategy\n    35→//\n    36→// Determines how to combine metric values when aggregating from finer to coarser scopes:\n    37→//\n    38→//   - NoAggregation: Do not combine (incompatible scopes)\n    39→//   - SumAggregation: Add values (e.g., power consumption: core→socket)\n    40→//   - AvgAggregation: Average values (e.g., temperature: core→socket)\n    41→package metricstore\n    42→\n    43→import (\n    44→\t\"fmt\"\n    45→\t\"time\"\n    46→\n    47→\t\"github.com/ClusterCockpit/cc-backend/pkg/archive\"\n    48→\tcclog \"github.com/ClusterCockpit/cc-lib/v2/ccLogger\"\n    49→\t\"github.com/ClusterCockpit/cc-lib/v2/schema\"\n    50→)\n    51→\n    52→const (\n    53→\tDefaultMaxWorkers                 = 10\n    54→\tDefaultBufferCapacity             = 512\n    55→\tDefaultGCTriggerInterval          = 100\n    56→\tDefaultMemoryUsageTrackerInterval = 1 * time.Hour\n    57→)\n    58→\n    59→// Checkpoints configures periodic persistence of in-memory metric data.\n    60→//\n    61→// Fields:\n    62→//   - FileFormat: \"json\" (human-readable, periodic) or \"wal\" (binary snapshot + WAL, crash-safe); default is \"wal\"\n    63→//   - RootDir:    Filesystem path for checkpoint files (created if missing)\n    64→type Checkpoints struct {\n    65→\tFileFormat string `json:\"file-format\"`\n    66→\tRootDir    string `json:\"directory\"`\n    67→}\n    68→\n    69→// Debug provides development and profiling options.\n    70→//\n    71→// Fields:\n    72→//   - DumpToFile: Path to dump checkpoint data for inspection (empty = disabled)\n    73→//   - EnableGops: Enable gops agent for live runtime debugging (https://github.com/google/gops)\n    74→type Debug struct {\n    75→\tDumpToFile string `json:\"dump-to-file\"`\n    76→\tEnableGops bool   `json:\"gops\"`\n    77→}\n    78→\n    79→// Cleanup configures long-term storage of old metric data.\n    80→//\n    81→// Data older than RetentionInMemory is archived to disk or deleted.\n    82→// The cleanup interval is always RetentionInMemory.\n    83→//\n    84→// Fields:\n    85→//   - RootDir: Filesystem path for archived data (used in \"archive\" mode)\n    86→//   - Mode:    \"delete\" (discard old data) or \"archive\" (write to RootDir)\n    87→type Cleanup struct {\n    88→\tRootDir string `json:\"directory\"`\n    89→\tMode    string `json:\"mode\"`\n    90→}\n    91→\n    92→// Subscriptions defines NATS topics to subscribe to for metric ingestion.\n    93→//\n    94→// Each subscription receives metrics via NATS messaging, enabling real-time\n    95→// data collection from compute nodes.\n    96→//\n    97→// Fields:\n    98→//   - SubscribeTo: NATS subject/channel name (e.g., \"metrics.compute.*\")\n    99→//   - ClusterTag:  Default cluster name for metrics without cluster tag (optional)\n   100→type Subscriptions []struct {\n   101→\t// Channel name\n   102→\tSubscribeTo string `json:\"subscribe-to\"`\n   103→\n   104→\t// Allow lines without a cluster tag, use this as default, optional\n   105→\tClusterTag string `json:\"cluster-tag\"`\n   106→}\n   107→\n   108→// MetricStoreConfig defines the main configuration for the metricstore.\n   109→//\n   110→// Loaded from cc-backend's config.json \"metricstore\" section. Controls memory usage,\n   111→// persistence, archiving, and metric ingestion.\n   112→//\n   113→// Fields:\n   114→//   - NumWorkers:        Parallel workers for checkpoint/archive (0 = auto: min(NumCPU/2+1, 10))\n   115→//   - RetentionInMemory: Duration string (e.g., \"48h\") for in-memory data retention\n   116→//   - MemoryCap:         Max bytes for buffer data (0 = unlimited); triggers forceFree when exceeded\n   117→//   - Checkpoints:       Periodic persistence configuration\n   118→//   - Debug:             Development/profiling options (nil = disabled)\n   119→//   - Archive:           Long-term storage configuration (nil = disabled)\n   120→//   - Subscriptions:     NATS topics for metric ingestion (nil = polling only)\n   121→type MetricStoreConfig struct {\n   122→\t// Number of concurrent workers for checkpoint and archive operations.\n   123→\t// If not set or 0, defaults to min(runtime.NumCPU()/2+1, 10)\n   124→\tNumWorkers        int            `json:\"num-workers\"`\n   125→\tRetentionInMemory string         `json:\"retention-in-memory\"`\n   126→\tMemoryCap         int            `json:\"memory-cap\"`\n   127→\tCheckpoints       Checkpoints    `json:\"checkpoints\"`\n   128→\tDebug             *Debug         `json:\"debug\"`\n   129→\tCleanup           *Cleanup       `json:\"cleanup\"`\n   130→\tSubscriptions     *Subscriptions `json:\"nats-subscriptions\"`\n   131→}\n   132→\n   133→// Keys is the global metricstore configuration instance.\n   134→//\n   135→// Initialized with defaults, then overwritten by cc-backend's config.json.\n   136→// Accessed by Init(), Checkpointing(), and other lifecycle functions.\n   137→var Keys MetricStoreConfig = MetricStoreConfig{\n   138→\tCheckpoints: Checkpoints{\n   139→\t\tFileFormat: \"wal\",\n   140→\t\tRootDir:    \"./var/checkpoints\",\n   141→\t},\n   142→\tCleanup: &Cleanup{\n   143→\t\tMode: \"delete\",\n   144→\t},\n   145→}\n   146→\n   147→// AggregationStrategy defines how to combine metric values across hierarchy levels.\n   148→//\n   149→// Used when transforming data from finer-grained scopes (e.g., core) to coarser scopes\n   150→// (e.g., socket). This is SPATIAL aggregation, not TEMPORAL (time-based) aggregation.\n   151→//\n   152→// Values:\n   153→//   - NoAggregation:  Do not aggregate (incompatible scopes or non-aggregatable metrics)\n   154→//   - SumAggregation: Add values (e.g., power: sum core power → socket power)\n   155→//   - AvgAggregation: Average values (e.g., temperature: average core temps → socket temp)\n   156→type AggregationStrategy int\n   157→\n   158→const (\n   159→\tNoAggregation  AggregationStrategy = iota // Do not aggregate\n   160→\tSumAggregation                            // Sum values (e.g., power, energy)\n   161→\tAvgAggregation                            // Average values (e.g., temperature, utilization)\n   162→)\n   163→\n   164→// AssignAggregationStrategy parses a string into an AggregationStrategy value.\n   165→//\n   166→// Used when loading metric configurations from JSON/YAML files.\n   167→//\n   168→// Parameters:\n   169→//   - str: \"sum\", \"avg\", or \"\" (empty string for NoAggregation)\n   170→//\n   171→// Returns:\n   172→//   - AggregationStrategy: Parsed value\n   173→//   - error:               Non-nil if str is unrecognized\n   174→func AssignAggregationStrategy(str string) (AggregationStrategy, error) {\n   175→\tswitch str {\n   176→\tcase \"\":\n   177→\t\treturn NoAggregation, nil\n   178→\tcase \"sum\":\n   179→\t\treturn SumAggregation, nil\n   180→\tcase \"avg\":\n   181→\t\treturn AvgAggregation, nil\n   182→\tdefault:\n   183→\t\treturn NoAggregation, fmt.Errorf(\"[METRICSTORE]> unknown aggregation strategy: %s\", str)\n   184→\t}\n   185→}\n   186→\n   187→// MetricConfig defines configuration for a single metric type.\n   188→//\n   189→// Stored in the global Metrics map, keyed by metric name (e.g., \"cpu_load\").\n   190→//\n   191→// Fields:\n   192→//   - Frequency:   Measurement interval in seconds (e.g., 60 for 1-minute granularity)\n   193→//   - Aggregation: How to combine values across hierarchy levels (sum/avg/none)\n   194→//   - offset:      Internal index into Level.metrics slice (assigned during Init)\n   195→type MetricConfig struct {\n   196→\t// Interval in seconds at which measurements are stored\n   197→\tFrequency int64\n   198→\n   199→\t// Can be 'sum', 'avg' or null. Describes how to aggregate metrics from the same timestep over the hierarchy.\n   200→\tAggregation AggregationStrategy\n   201→\n   202→\t// Private, used internally...\n   203→\toffset int\n   204→}\n   205→\n   206→func BuildMetricList() map[string]MetricConfig {\n   207→\tvar metrics map[string]MetricConfig = make(map[string]MetricConfig)\n   208→\n   209→\taddMetric := func(name string, metric MetricConfig) error {\n   210→\t\tif metrics == nil {\n   211→\t\t\tmetrics = make(map[string]MetricConfig, 0)\n   212→\t\t}\n   213→\n   214→\t\tif existingMetric, ok := metrics[name]; ok {\n   215→\t\t\tif existingMetric.Frequency != metric.Frequency {\n   216→\t\t\t\tif existingMetric.Frequency < metric.Frequency {\n   217→\t\t\t\t\texistingMetric.Frequency = metric.Frequency\n   218→\t\t\t\t\tmetrics[name] = existingMetric\n   219→\t\t\t\t}\n   220→\t\t\t}\n   221→\t\t} else {\n   222→\t\t\tmetrics[name] = metric\n   223→\t\t}\n   224→\n   225→\t\treturn nil\n   226→\t}\n   227→\n   228→\t// Helper function to add metric configuration\n   229→\taddMetricConfig := func(mc *schema.MetricConfig) {\n   230→\t\tagg, err := AssignAggregationStrategy(mc.Aggregation)\n   231→\t\tif err != nil {\n   232→\t\t\tcclog.Warnf(\"Could not find aggregation strategy for metric config '%s': %s\", mc.Name, err.Error())\n   233→\t\t}\n   234→\n   235→\t\taddMetric(mc.Name, MetricConfig{\n   236→\t\t\tFrequency:   int64(mc.Timestep),\n   237→\t\t\tAggregation: agg,\n   238→\t\t})\n   239→\t}\n   240→\tfor _, c := range archive.Clusters {\n   241→\t\tfor _, mc := range c.MetricConfig {\n   242→\t\t\taddMetricConfig(mc)\n   243→\t\t}\n   244→\n   245→\t\tfor _, sc := range c.SubClusters {\n   246→\t\t\tfor _, mc := range sc.MetricConfig {\n   247→\t\t\t\taddMetricConfig(mc)\n   248→\t\t\t}\n   249→\t\t}\n   250→\t}\n   251→\n   252→\treturn metrics\n   253→}\n   254→"}]},"uuid":"e3daed94-d74d-41af-b75e-b2aebb72d6ee","timestamp":"2026-03-13T06:51:38.807Z","toolUseResult":{"type":"text","file":{"filePath":"/Users/jan/prg/ClusterCockpit/cc-backend/pkg/metricstore/config.go","content":"// Copyright (C) NHR@FAU, University Erlangen-Nuremberg.\n// All rights reserved. This file is part of cc-backend.\n// Use of this source code is governed by a MIT-style\n// license that can be found in the LICENSE file.\n\n// Package metricstore provides config.go: Configuration structures and metric management.\n//\n// # Configuration Hierarchy\n//\n// The metricstore package uses nested configuration structures:\n//\n//\tMetricStoreConfig (Keys)\n//\t├─ NumWorkers: Parallel checkpoint/archive workers\n//\t├─ RetentionInMemory: How long to keep data in RAM (also used as cleanup interval)\n//\t├─ MemoryCap: Memory limit in bytes (triggers forceFree)\n//\t├─ Checkpoints: Persistence configuration\n//\t│  ├─ FileFormat: \"json\" or \"wal\" (default: \"wal\")\n//\t│  └─ RootDir: Checkpoint storage path\n//\t├─ Cleanup: Long-term storage configuration (interval = RetentionInMemory)\n//\t│  ├─ RootDir: Archive storage path (archive mode only)\n//\t│  └─ Mode: \"delete\" or \"archive\"\n//\t├─ Debug: Development/debugging options\n//\t└─ Subscriptions: NATS topic subscriptions for metric ingestion\n//\n// # Metric Configuration\n//\n// Each metric (e.g., \"cpu_load\", \"mem_used\") has a MetricConfig entry in the global\n// Metrics map, defining:\n//\n//   - Frequency: Measurement interval in seconds\n//   - Aggregation: How to combine values (sum/avg/none) when transforming scopes\n//   - offset: Internal index into Level.metrics slice (assigned during Init)\n//\n// # AggregationStrategy\n//\n// Determines how to combine metric values when aggregating from finer to coarser scopes:\n//\n//   - NoAggregation: Do not combine (incompatible scopes)\n//   - SumAggregation: Add values (e.g., power consumption: core→socket)\n//   - AvgAggregation: Average values (e.g., temperature: core→socket)\npackage metricstore\n\nimport (\n\t\"fmt\"\n\t\"time\"\n\n\t\"github.com/ClusterCockpit/cc-backend/pkg/archive\"\n\tcclog \"github.com/ClusterCockpit/cc-lib/v2/ccLogger\"\n\t\"github.com/ClusterCockpit/cc-lib/v2/schema\"\n)\n\nconst (\n\tDefaultMaxWorkers                 = 10\n\tDefaultBufferCapacity             = 512\n\tDefaultGCTriggerInterval          = 100\n\tDefaultMemoryUsageTrackerInterval = 1 * time.Hour\n)\n\n// Checkpoints configures periodic persistence of in-memory metric data.\n//\n// Fields:\n//   - FileFormat: \"json\" (human-readable, periodic) or \"wal\" (binary snapshot + WAL, crash-safe); default is \"wal\"\n//   - RootDir:    Filesystem path for checkpoint files (created if missing)\ntype Checkpoints struct {\n\tFileFormat string `json:\"file-format\"`\n\tRootDir    string `json:\"directory\"`\n}\n\n// Debug provides development and profiling options.\n//\n// Fields:\n//   - DumpToFile: Path to dump checkpoint data for inspection (empty = disabled)\n//   - EnableGops: Enable gops agent for live runtime debugging (https://github.com/google/gops)\ntype Debug struct {\n\tDumpToFile string `json:\"dump-to-file\"`\n\tEnableGops bool   `json:\"gops\"`\n}\n\n// Cleanup configures long-term storage of old metric data.\n//\n// Data older than RetentionInMemory is archived to disk or deleted.\n// The cleanup interval is always RetentionInMemory.\n//\n// Fields:\n//   - RootDir: Filesystem path for archived data (used in \"archive\" mode)\n//   - Mode:    \"delete\" (discard old data) or \"archive\" (write to RootDir)\ntype Cleanup struct {\n\tRootDir string `json:\"directory\"`\n\tMode    string `json:\"mode\"`\n}\n\n// Subscriptions defines NATS topics to subscribe to for metric ingestion.\n//\n// Each subscription receives metrics via NATS messaging, enabling real-time\n// data collection from compute nodes.\n//\n// Fields:\n//   - SubscribeTo: NATS subject/channel name (e.g., \"metrics.compute.*\")\n//   - ClusterTag:  Default cluster name for metrics without cluster tag (optional)\ntype Subscriptions []struct {\n\t// Channel name\n\tSubscribeTo string `json:\"subscribe-to\"`\n\n\t// Allow lines without a cluster tag, use this as default, optional\n\tClusterTag string `json:\"cluster-tag\"`\n}\n\n// MetricStoreConfig defines the main configuration for the metricstore.\n//\n// Loaded from cc-backend's config.json \"metricstore\" section. Controls memory usage,\n// persistence, archiving, and metric ingestion.\n//\n// Fields:\n//   - NumWorkers:        Parallel workers for checkpoint/archive (0 = auto: min(NumCPU/2+1, 10))\n//   - RetentionInMemory: Duration string (e.g., \"48h\") for in-memory data retention\n//   - MemoryCap:         Max bytes for buffer data (0 = unlimited); triggers forceFree when exceeded\n//   - Checkpoints:       Periodic persistence configuration\n//   - Debug:             Development/profiling options (nil = disabled)\n//   - Archive:           Long-term storage configuration (nil = disabled)\n//   - Subscriptions:     NATS topics for metric ingestion (nil = polling only)\ntype MetricStoreConfig struct {\n\t// Number of concurrent workers for checkpoint and archive operations.\n\t// If not set or 0, defaults to min(runtime.NumCPU()/2+1, 10)\n\tNumWorkers        int            `json:\"num-workers\"`\n\tRetentionInMemory string         `json:\"retention-in-memory\"`\n\tMemoryCap         int            `json:\"memory-cap\"`\n\tCheckpoints       Checkpoints    `json:\"checkpoints\"`\n\tDebug             *Debug         `json:\"debug\"`\n\tCleanup           *Cleanup       `json:\"cleanup\"`\n\tSubscriptions     *Subscriptions `json:\"nats-subscriptions\"`\n}\n\n// Keys is the global metricstore configuration instance.\n//\n// Initialized with defaults, then overwritten by cc-backend's config.json.\n// Accessed by Init(), Checkpointing(), and other lifecycle functions.\nvar Keys MetricStoreConfig = MetricStoreConfig{\n\tCheckpoints: Checkpoints{\n\t\tFileFormat: \"wal\",\n\t\tRootDir:    \"./var/checkpoints\",\n\t},\n\tCleanup: &Cleanup{\n\t\tMode: \"delete\",\n\t},\n}\n\n// AggregationStrategy defines how to combine metric values across hierarchy levels.\n//\n// Used when transforming data from finer-grained scopes (e.g., core) to coarser scopes\n// (e.g., socket). This is SPATIAL aggregation, not TEMPORAL (time-based) aggregation.\n//\n// Values:\n//   - NoAggregation:  Do not aggregate (incompatible scopes or non-aggregatable metrics)\n//   - SumAggregation: Add values (e.g., power: sum core power → socket power)\n//   - AvgAggregation: Average values (e.g., temperature: average core temps → socket temp)\ntype AggregationStrategy int\n\nconst (\n\tNoAggregation  AggregationStrategy = iota // Do not aggregate\n\tSumAggregation                            // Sum values (e.g., power, energy)\n\tAvgAggregation                            // Average values (e.g., temperature, utilization)\n)\n\n// AssignAggregationStrategy parses a string into an AggregationStrategy value.\n//\n// Used when loading metric configurations from JSON/YAML files.\n//\n// Parameters:\n//   - str: \"sum\", \"avg\", or \"\" (empty string for NoAggregation)\n//\n// Returns:\n//   - AggregationStrategy: Parsed value\n//   - error:               Non-nil if str is unrecognized\nfunc AssignAggregationStrategy(str string) (AggregationStrategy, error) {\n\tswitch str {\n\tcase \"\":\n\t\treturn NoAggregation, nil\n\tcase \"sum\":\n\t\treturn SumAggregation, nil\n\tcase \"avg\":\n\t\treturn AvgAggregation, nil\n\tdefault:\n\t\treturn NoAggregation, fmt.Errorf(\"[METRICSTORE]> unknown aggregation strategy: %s\", str)\n\t}\n}\n\n// MetricConfig defines configuration for a single metric type.\n//\n// Stored in the global Metrics map, keyed by metric name (e.g., \"cpu_load\").\n//\n// Fields:\n//   - Frequency:   Measurement interval in seconds (e.g., 60 for 1-minute granularity)\n//   - Aggregation: How to combine values across hierarchy levels (sum/avg/none)\n//   - offset:      Internal index into Level.metrics slice (assigned during Init)\ntype MetricConfig struct {\n\t// Interval in seconds at which measurements are stored\n\tFrequency int64\n\n\t// Can be 'sum', 'avg' or null. Describes how to aggregate metrics from the same timestep over the hierarchy.\n\tAggregation AggregationStrategy\n\n\t// Private, used internally...\n\toffset int\n}\n\nfunc BuildMetricList() map[string]MetricConfig {\n\tvar metrics map[string]MetricConfig = make(map[string]MetricConfig)\n\n\taddMetric := func(name string, metric MetricConfig) error {\n\t\tif metrics == nil {\n\t\t\tmetrics = make(map[string]MetricConfig, 0)\n\t\t}\n\n\t\tif existingMetric, ok := metrics[name]; ok {\n\t\t\tif existingMetric.Frequency != metric.Frequency {\n\t\t\t\tif existingMetric.Frequency < metric.Frequency {\n\t\t\t\t\texistingMetric.Frequency = metric.Frequency\n\t\t\t\t\tmetrics[name] = existingMetric\n\t\t\t\t}\n\t\t\t}\n\t\t} else {\n\t\t\tmetrics[name] = metric\n\t\t}\n\n\t\treturn nil\n\t}\n\n\t// Helper function to add metric configuration\n\taddMetricConfig := func(mc *schema.MetricConfig) {\n\t\tagg, err := AssignAggregationStrategy(mc.Aggregation)\n\t\tif err != nil {\n\t\t\tcclog.Warnf(\"Could not find aggregation strategy for metric config '%s': %s\", mc.Name, err.Error())\n\t\t}\n\n\t\taddMetric(mc.Name, MetricConfig{\n\t\t\tFrequency:   int64(mc.Timestep),\n\t\t\tAggregation: agg,\n\t\t})\n\t}\n\tfor _, c := range archive.Clusters {\n\t\tfor _, mc := range c.MetricConfig {\n\t\t\taddMetricConfig(mc)\n\t\t}\n\n\t\tfor _, sc := range c.SubClusters {\n\t\t\tfor _, mc := range sc.MetricConfig {\n\t\t\t\taddMetricConfig(mc)\n\t\t\t}\n\t\t}\n\t}\n\n\treturn metrics\n}\n","numLines":254,"startLine":1,"totalLines":254}},"sourceToolAssistantUUID":"02aaffa4-66f2-4db0-999f-096c2db78c1f","userType":"external","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"39705f8c-1691-4d60-b0aa-39f588ed9dcf","version":"2.1.74","gitBranch":"hotfix","slug":"linear-roaming-glade"}
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{"parentUuid":"e77a0811-b490-4192-92c6-cdb285981ce5","isSidechain":false,"promptId":"a631224c-8362-4377-bee6-9ff6c4b66c68","type":"user","message":{"role":"user","content":[{"tool_use_id":"toolu_013GrPD7Ni1PDgit3SmkH6gF","type":"tool_result","content":"     1→// Copyright (C) NHR@FAU, University Erlangen-Nuremberg.\n     2→// All rights reserved. This file is part of cc-backend.\n     3→// Use of this source code is governed by a MIT-style\n     4→// license that can be found in the LICENSE file.\n     5→\n     6→// This file implements ingestion of InfluxDB line-protocol metric data received\n     7→// over NATS. Each line encodes one metric sample with the following structure:\n     8→//\n     9→//\t<measurement>[,cluster=<c>][,hostname=<h>][,type=<t>][,type-id=<id>][,subtype=<s>][,stype-id=<id>] value=<v> [<timestamp>]\n    10→//\n    11→// The measurement name identifies the metric (e.g. \"cpu_load\"). Tags provide\n    12→// routing information (cluster, host) and optional sub-device selectors (type,\n    13→// subtype). Only one field is expected per line: \"value\".\n    14→//\n    15→// After decoding, each sample is:\n    16→//  1. Written to the in-memory store via ms.WriteToLevel.\n    17→//  2. If the checkpoint format is \"wal\", also forwarded to the WAL staging\n    18→//     goroutine via the WALMessages channel for durable write-ahead logging.\n    19→package metricstore\n    20→\n    21→import (\n    22→\t\"bytes\"\n    23→\t\"context\"\n    24→\t\"fmt\"\n    25→\t\"sync\"\n    26→\t\"time\"\n    27→\n    28→\tcclog \"github.com/ClusterCockpit/cc-lib/v2/ccLogger\"\n    29→\t\"github.com/ClusterCockpit/cc-lib/v2/nats\"\n    30→\t\"github.com/ClusterCockpit/cc-lib/v2/schema\"\n    31→\t\"github.com/ClusterCockpit/cc-line-protocol/v2/lineprotocol\"\n    32→)\n    33→\n    34→// ReceiveNats subscribes to all configured NATS subjects and feeds incoming\n    35→// line-protocol messages into the MemoryStore.\n    36→//\n    37→// When workers > 1 a pool of goroutines drains a shared channel so that\n    38→// multiple messages can be decoded in parallel. With workers == 1 the NATS\n    39→// callback decodes inline (no channel overhead, lower latency).\n    40→//\n    41→// The function blocks until ctx is cancelled and all worker goroutines have\n    42→// finished. It returns nil when the NATS client is not configured; callers\n    43→// should treat that as a no-op rather than an error.\n    44→func ReceiveNats(ms *MemoryStore,\n    45→\tworkers int,\n    46→\tctx context.Context,\n    47→) error {\n    48→\tnc := nats.GetClient()\n    49→\n    50→\tif nc == nil {\n    51→\t\tcclog.Warn(\"NATS client not initialized\")\n    52→\t\treturn nil\n    53→\t}\n    54→\n    55→\tvar wg sync.WaitGroup\n    56→\tmsgs := make(chan []byte, workers*2)\n    57→\n    58→\tfor _, sc := range *Keys.Subscriptions {\n    59→\t\tclusterTag := sc.ClusterTag\n    60→\t\tif workers > 1 {\n    61→\t\t\twg.Add(workers)\n    62→\n    63→\t\t\tfor range workers {\n    64→\t\t\t\tgo func() {\n    65→\t\t\t\t\tdefer wg.Done()\n    66→\t\t\t\t\tfor m := range msgs {\n    67→\t\t\t\t\t\tdec := lineprotocol.NewDecoderWithBytes(m)\n    68→\t\t\t\t\t\tif err := DecodeLine(dec, ms, clusterTag); err != nil {\n    69→\t\t\t\t\t\t\tcclog.Errorf(\"error: %s\", err.Error())\n    70→\t\t\t\t\t\t}\n    71→\t\t\t\t\t}\n    72→\t\t\t\t}()\n    73→\t\t\t}\n    74→\n    75→\t\t\tnc.Subscribe(sc.SubscribeTo, func(subject string, data []byte) {\n    76→\t\t\t\tselect {\n    77→\t\t\t\tcase msgs <- data:\n    78→\t\t\t\tcase <-ctx.Done():\n    79→\t\t\t\t}\n    80→\t\t\t})\n    81→\t\t} else {\n    82→\t\t\tnc.Subscribe(sc.SubscribeTo, func(subject string, data []byte) {\n    83→\t\t\t\tdec := lineprotocol.NewDecoderWithBytes(data)\n    84→\t\t\t\tif err := DecodeLine(dec, ms, clusterTag); err != nil {\n    85→\t\t\t\t\tcclog.Errorf(\"error: %s\", err.Error())\n    86→\t\t\t\t}\n    87→\t\t\t})\n    88→\t\t}\n    89→\t\tcclog.Infof(\"NATS subscription to '%s' established\", sc.SubscribeTo)\n    90→\t}\n    91→\n    92→\tgo func() {\n    93→\t\t<-ctx.Done()\n    94→\t\tclose(msgs)\n    95→\t}()\n    96→\n    97→\twg.Wait()\n    98→\n    99→\treturn nil\n   100→}\n   101→\n   102→// reorder prepends prefix to buf in-place when buf has enough spare capacity,\n   103→// avoiding an allocation. Falls back to a regular append otherwise.\n   104→//\n   105→// It is used to assemble the \"type<type-id>\" and \"subtype<stype-id>\" selector\n   106→// strings when the type tag arrives before the type-id tag in the line, so the\n   107→// two byte slices need to be concatenated in tag-declaration order regardless\n   108→// of wire order.\n   109→func reorder(buf, prefix []byte) []byte {\n   110→\tn := len(prefix)\n   111→\tm := len(buf)\n   112→\tif cap(buf) < m+n {\n   113→\t\treturn append(prefix[:n:n], buf...)\n   114→\t} else {\n   115→\t\tbuf = buf[:n+m]\n   116→\t\tfor i := m - 1; i >= 0; i-- {\n   117→\t\t\tbuf[i+n] = buf[i]\n   118→\t\t}\n   119→\t\tfor i := range n {\n   120→\t\t\tbuf[i] = prefix[i]\n   121→\t\t}\n   122→\t\treturn buf\n   123→\t}\n   124→}\n   125→\n   126→// decodeState holds the per-call scratch buffers used by DecodeLine.\n   127→// Instances are recycled via decodeStatePool to avoid repeated allocations\n   128→// during high-throughput ingestion.\n   129→type decodeState struct {\n   130→\t// metricBuf holds a copy of the current measurement name (line-protocol\n   131→\t// measurement field). Copied because dec.Measurement() returns a slice\n   132→\t// that is invalidated by the next decoder call.\n   133→\tmetricBuf []byte\n   134→\n   135→\t// selector is the sub-device path passed to WriteToLevel and WALMessage\n   136→\t// (e.g. [\"socket0\"] or [\"socket0\", \"memctrl1\"]). Reused across lines.\n   137→\tselector []string\n   138→\n   139→\t// typeBuf accumulates the concatenated \"type\"+\"type-id\" tag value for the\n   140→\t// current line. Reset at the start of each line's tag-decode loop.\n   141→\ttypeBuf []byte\n   142→\n   143→\t// subTypeBuf accumulates the concatenated \"subtype\"+\"stype-id\" tag value.\n   144→\t// Reset at the start of each line's tag-decode loop.\n   145→\tsubTypeBuf []byte\n   146→\n   147→\t// prevTypeBytes / prevTypeStr cache the last seen typeBuf content and its\n   148→\t// string conversion. Because consecutive lines in a batch typically address\n   149→\t// the same sub-device, the cache hit rate is very high and avoids\n   150→\t// repeated []byte→string allocations.\n   151→\tprevTypeBytes []byte\n   152→\tprevTypeStr   string\n   153→\n   154→\t// prevSubTypeBytes / prevSubTypeStr are the same cache for the subtype.\n   155→\tprevSubTypeBytes []byte\n   156→\tprevSubTypeStr   string\n   157→}\n   158→\n   159→// decodeStatePool recycles decodeState values across DecodeLine calls to\n   160→// reduce GC pressure during sustained metric ingestion.\n   161→var decodeStatePool = sync.Pool{\n   162→\tNew: func() any {\n   163→\t\treturn &decodeState{\n   164→\t\t\tmetricBuf:  make([]byte, 0, 16),\n   165→\t\t\tselector:   make([]string, 0, 4),\n   166→\t\t\ttypeBuf:    make([]byte, 0, 16),\n   167→\t\t\tsubTypeBuf: make([]byte, 0, 16),\n   168→\t\t}\n   169→\t},\n   170→}\n   171→\n   172→// DecodeLine reads all lines from dec (InfluxDB line-protocol) and writes each\n   173→// decoded metric sample into ms.\n   174→//\n   175→// clusterDefault is used as the cluster name for lines that do not carry a\n   176→// \"cluster\" tag. Callers typically supply the ClusterTag value from the NATS\n   177→// subscription configuration.\n   178→//\n   179→// Performance notes:\n   180→//   - A decodeState is obtained from decodeStatePool to reuse scratch buffers.\n   181→//   - The Level pointer (host-level node in the metric tree) is cached across\n   182→//     consecutive lines that share the same cluster+host pair to avoid\n   183→//     repeated lock acquisitions on the root and cluster levels.\n   184→//   - []byte→string conversions for type/subtype selectors are cached via\n   185→//     prevType*/prevSubType* fields because batches typically repeat the same\n   186→//     sub-device identifiers.\n   187→//   - Timestamp parsing tries Second precision first; if that fails it retries\n   188→//     Millisecond, Microsecond, and Nanosecond in turn. A missing timestamp\n   189→//     falls back to time.Now().\n   190→//\n   191→// When the checkpoint format is \"wal\" each successfully decoded sample is also\n   192→// sent to WALMessages so the WAL staging goroutine can persist it durably\n   193→// before the next binary snapshot.\n   194→func DecodeLine(dec *lineprotocol.Decoder,\n   195→\tms *MemoryStore,\n   196→\tclusterDefault string,\n   197→) error {\n   198→\t// Reduce allocations in loop:\n   199→\tt := time.Now()\n   200→\tmetric := Metric{}\n   201→\tst := decodeStatePool.Get().(*decodeState)\n   202→\tdefer decodeStatePool.Put(st)\n   203→\n   204→\t// Optimize for the case where all lines in a \"batch\" are about the same\n   205→\t// cluster and host. By using `WriteToLevel` (level = host), we do not need\n   206→\t// to take the root- and cluster-level lock as often.\n   207→\tvar lvl *Level = nil\n   208→\tprevCluster, prevHost := \"\", \"\"\n   209→\n   210→\tvar ok bool\n   211→\tfor dec.Next() {\n   212→\t\trawmeasurement, err := dec.Measurement()\n   213→\t\tif err != nil {\n   214→\t\t\treturn err\n   215→\t\t}\n   216→\n   217→\t\t// Needs to be copied because another call to dec.* would\n   218→\t\t// invalidate the returned slice.\n   219→\t\tst.metricBuf = append(st.metricBuf[:0], rawmeasurement...)\n   220→\n   221→\t\t// The go compiler optimizes map[string(byteslice)] lookups:\n   222→\t\tmetric.MetricConfig, ok = ms.Metrics[string(rawmeasurement)]\n   223→\t\tif !ok {\n   224→\t\t\tcontinue\n   225→\t\t}\n   226→\n   227→\t\tst.typeBuf, st.subTypeBuf = st.typeBuf[:0], st.subTypeBuf[:0]\n   228→\t\tcluster, host := clusterDefault, \"\"\n   229→\t\tfor {\n   230→\t\t\tkey, val, err := dec.NextTag()\n   231→\t\t\tif err != nil {\n   232→\t\t\t\treturn err\n   233→\t\t\t}\n   234→\t\t\tif key == nil {\n   235→\t\t\t\tbreak\n   236→\t\t\t}\n   237→\n   238→\t\t\t// The go compiler optimizes string([]byte{...}) == \"...\":\n   239→\t\t\tswitch string(key) {\n   240→\t\t\tcase \"cluster\":\n   241→\t\t\t\tif string(val) == prevCluster {\n   242→\t\t\t\t\tcluster = prevCluster\n   243→\t\t\t\t} else {\n   244→\t\t\t\t\tcluster = string(val)\n   245→\t\t\t\t\tlvl = nil\n   246→\t\t\t\t}\n   247→\t\t\tcase \"hostname\", \"host\":\n   248→\t\t\t\tif string(val) == prevHost {\n   249→\t\t\t\t\thost = prevHost\n   250→\t\t\t\t} else {\n   251→\t\t\t\t\thost = string(val)\n   252→\t\t\t\t\tlvl = nil\n   253→\t\t\t\t}\n   254→\t\t\tcase \"type\":\n   255→\t\t\t\tif string(val) == \"node\" {\n   256→\t\t\t\t\tbreak\n   257→\t\t\t\t}\n   258→\n   259→\t\t\t\t// We cannot be sure that the \"type\" tag comes before the \"type-id\" tag:\n   260→\t\t\t\tif len(st.typeBuf) == 0 {\n   261→\t\t\t\t\tst.typeBuf = append(st.typeBuf, val...)\n   262→\t\t\t\t} else {\n   263→\t\t\t\t\tst.typeBuf = reorder(st.typeBuf, val)\n   264→\t\t\t\t}\n   265→\t\t\tcase \"type-id\":\n   266→\t\t\t\tst.typeBuf = append(st.typeBuf, val...)\n   267→\t\t\tcase \"subtype\":\n   268→\t\t\t\t// We cannot be sure that the \"subtype\" tag comes before the \"stype-id\" tag:\n   269→\t\t\t\tif len(st.subTypeBuf) == 0 {\n   270→\t\t\t\t\tst.subTypeBuf = append(st.subTypeBuf, val...)\n   271→\t\t\t\t} else {\n   272→\t\t\t\t\tst.subTypeBuf = reorder(st.subTypeBuf, val)\n   273→\t\t\t\t}\n   274→\t\t\tcase \"stype-id\":\n   275→\t\t\t\tst.subTypeBuf = append(st.subTypeBuf, val...)\n   276→\t\t\tdefault:\n   277→\t\t\t}\n   278→\t\t}\n   279→\n   280→\t\t// If the cluster or host changed, the lvl was set to nil\n   281→\t\tif lvl == nil {\n   282→\t\t\tst.selector = st.selector[:2]\n   283→\t\t\tst.selector[0], st.selector[1] = cluster, host\n   284→\t\t\tlvl = ms.GetLevel(st.selector)\n   285→\t\t\tprevCluster, prevHost = cluster, host\n   286→\t\t}\n   287→\n   288→\t\t// subtypes: cache []byte→string conversions; messages in a batch typically\n   289→\t\t// share the same type/subtype so the hit rate is very high.\n   290→\t\tst.selector = st.selector[:0]\n   291→\t\tif len(st.typeBuf) > 0 {\n   292→\t\t\tif !bytes.Equal(st.typeBuf, st.prevTypeBytes) {\n   293→\t\t\t\tst.prevTypeBytes = append(st.prevTypeBytes[:0], st.typeBuf...)\n   294→\t\t\t\tst.prevTypeStr = string(st.typeBuf)\n   295→\t\t\t}\n   296→\t\t\tst.selector = append(st.selector, st.prevTypeStr)\n   297→\t\t\tif len(st.subTypeBuf) > 0 {\n   298→\t\t\t\tif !bytes.Equal(st.subTypeBuf, st.prevSubTypeBytes) {\n   299→\t\t\t\t\tst.prevSubTypeBytes = append(st.prevSubTypeBytes[:0], st.subTypeBuf...)\n   300→\t\t\t\t\tst.prevSubTypeStr = string(st.subTypeBuf)\n   301→\t\t\t\t}\n   302→\t\t\t\tst.selector = append(st.selector, st.prevSubTypeStr)\n   303→\t\t\t}\n   304→\t\t}\n   305→\n   306→\t\tfor {\n   307→\t\t\tkey, val, err := dec.NextField()\n   308→\t\t\tif err != nil {\n   309→\t\t\t\treturn err\n   310→\t\t\t}\n   311→\n   312→\t\t\tif key == nil {\n   313→\t\t\t\tbreak\n   314→\t\t\t}\n   315→\n   316→\t\t\tif string(key) != \"value\" {\n   317→\t\t\t\treturn fmt.Errorf(\"host %s: unknown field: '%s' (value: %#v)\", host, string(key), val)\n   318→\t\t\t}\n   319→\n   320→\t\t\tif val.Kind() == lineprotocol.Float {\n   321→\t\t\t\tmetric.Value = schema.Float(val.FloatV())\n   322→\t\t\t} else if val.Kind() == lineprotocol.Int {\n   323→\t\t\t\tmetric.Value = schema.Float(val.IntV())\n   324→\t\t\t} else if val.Kind() == lineprotocol.Uint {\n   325→\t\t\t\tmetric.Value = schema.Float(val.UintV())\n   326→\t\t\t} else {\n   327→\t\t\t\treturn fmt.Errorf(\"host %s: unsupported value type in message: %s\", host, val.Kind().String())\n   328→\t\t\t}\n   329→\t\t}\n   330→\n   331→\t\tif t, err = dec.Time(lineprotocol.Second, t); err != nil {\n   332→\t\t\tt = time.Now()\n   333→\t\t\tif t, err = dec.Time(lineprotocol.Millisecond, t); err != nil {\n   334→\t\t\t\tt = time.Now()\n   335→\t\t\t\tif t, err = dec.Time(lineprotocol.Microsecond, t); err != nil {\n   336→\t\t\t\t\tt = time.Now()\n   337→\t\t\t\t\tif t, err = dec.Time(lineprotocol.Nanosecond, t); err != nil {\n   338→\t\t\t\t\t\treturn fmt.Errorf(\"host %s: timestamp : %#v with error : %#v\", host, t, err.Error())\n   339→\t\t\t\t\t}\n   340→\t\t\t\t}\n   341→\t\t\t}\n   342→\t\t}\n   343→\n   344→\t\tif err != nil {\n   345→\t\t\treturn fmt.Errorf(\"host %s: timestamp : %#v with error : %#v\", host, t, err.Error())\n   346→\t\t}\n   347→\n   348→\t\ttime := t.Unix()\n   349→\n   350→\t\tif Keys.Checkpoints.FileFormat == \"wal\" {\n   351→\t\t\tWALMessages <- &WALMessage{\n   352→\t\t\t\tMetricName: string(st.metricBuf),\n   353→\t\t\t\tCluster:    cluster,\n   354→\t\t\t\tNode:       host,\n   355→\t\t\t\tSelector:   append([]string{}, st.selector...),\n   356→\t\t\t\tValue:      metric.Value,\n   357→\t\t\t\tTimestamp:  time,\n   358→\t\t\t}\n   359→\t\t}\n   360→\n   361→\t\tif err := ms.WriteToLevel(lvl, st.selector, time, []Metric{metric}); err != nil {\n   362→\t\t\treturn err\n   363→\t\t}\n   364→\t}\n   365→\treturn nil\n   366→}\n   367→"}]},"uuid":"86ae12ed-29df-49e4-b55a-f8bef65401d0","timestamp":"2026-03-13T06:51:39.255Z","toolUseResult":{"type":"text","file":{"filePath":"/Users/jan/prg/ClusterCockpit/cc-backend/pkg/metricstore/lineprotocol.go","content":"// Copyright (C) NHR@FAU, University Erlangen-Nuremberg.\n// All rights reserved. This file is part of cc-backend.\n// Use of this source code is governed by a MIT-style\n// license that can be found in the LICENSE file.\n\n// This file implements ingestion of InfluxDB line-protocol metric data received\n// over NATS. Each line encodes one metric sample with the following structure:\n//\n//\t<measurement>[,cluster=<c>][,hostname=<h>][,type=<t>][,type-id=<id>][,subtype=<s>][,stype-id=<id>] value=<v> [<timestamp>]\n//\n// The measurement name identifies the metric (e.g. \"cpu_load\"). Tags provide\n// routing information (cluster, host) and optional sub-device selectors (type,\n// subtype). Only one field is expected per line: \"value\".\n//\n// After decoding, each sample is:\n//  1. Written to the in-memory store via ms.WriteToLevel.\n//  2. If the checkpoint format is \"wal\", also forwarded to the WAL staging\n//     goroutine via the WALMessages channel for durable write-ahead logging.\npackage metricstore\n\nimport (\n\t\"bytes\"\n\t\"context\"\n\t\"fmt\"\n\t\"sync\"\n\t\"time\"\n\n\tcclog \"github.com/ClusterCockpit/cc-lib/v2/ccLogger\"\n\t\"github.com/ClusterCockpit/cc-lib/v2/nats\"\n\t\"github.com/ClusterCockpit/cc-lib/v2/schema\"\n\t\"github.com/ClusterCockpit/cc-line-protocol/v2/lineprotocol\"\n)\n\n// ReceiveNats subscribes to all configured NATS subjects and feeds incoming\n// line-protocol messages into the MemoryStore.\n//\n// When workers > 1 a pool of goroutines drains a shared channel so that\n// multiple messages can be decoded in parallel. With workers == 1 the NATS\n// callback decodes inline (no channel overhead, lower latency).\n//\n// The function blocks until ctx is cancelled and all worker goroutines have\n// finished. It returns nil when the NATS client is not configured; callers\n// should treat that as a no-op rather than an error.\nfunc ReceiveNats(ms *MemoryStore,\n\tworkers int,\n\tctx context.Context,\n) error {\n\tnc := nats.GetClient()\n\n\tif nc == nil {\n\t\tcclog.Warn(\"NATS client not initialized\")\n\t\treturn nil\n\t}\n\n\tvar wg sync.WaitGroup\n\tmsgs := make(chan []byte, workers*2)\n\n\tfor _, sc := range *Keys.Subscriptions {\n\t\tclusterTag := sc.ClusterTag\n\t\tif workers > 1 {\n\t\t\twg.Add(workers)\n\n\t\t\tfor range workers {\n\t\t\t\tgo func() {\n\t\t\t\t\tdefer wg.Done()\n\t\t\t\t\tfor m := range msgs {\n\t\t\t\t\t\tdec := lineprotocol.NewDecoderWithBytes(m)\n\t\t\t\t\t\tif err := DecodeLine(dec, ms, clusterTag); err != nil {\n\t\t\t\t\t\t\tcclog.Errorf(\"error: %s\", err.Error())\n\t\t\t\t\t\t}\n\t\t\t\t\t}\n\t\t\t\t}()\n\t\t\t}\n\n\t\t\tnc.Subscribe(sc.SubscribeTo, func(subject string, data []byte) {\n\t\t\t\tselect {\n\t\t\t\tcase msgs <- data:\n\t\t\t\tcase <-ctx.Done():\n\t\t\t\t}\n\t\t\t})\n\t\t} else {\n\t\t\tnc.Subscribe(sc.SubscribeTo, func(subject string, data []byte) {\n\t\t\t\tdec := lineprotocol.NewDecoderWithBytes(data)\n\t\t\t\tif err := DecodeLine(dec, ms, clusterTag); err != nil {\n\t\t\t\t\tcclog.Errorf(\"error: %s\", err.Error())\n\t\t\t\t}\n\t\t\t})\n\t\t}\n\t\tcclog.Infof(\"NATS subscription to '%s' established\", sc.SubscribeTo)\n\t}\n\n\tgo func() {\n\t\t<-ctx.Done()\n\t\tclose(msgs)\n\t}()\n\n\twg.Wait()\n\n\treturn nil\n}\n\n// reorder prepends prefix to buf in-place when buf has enough spare capacity,\n// avoiding an allocation. Falls back to a regular append otherwise.\n//\n// It is used to assemble the \"type<type-id>\" and \"subtype<stype-id>\" selector\n// strings when the type tag arrives before the type-id tag in the line, so the\n// two byte slices need to be concatenated in tag-declaration order regardless\n// of wire order.\nfunc reorder(buf, prefix []byte) []byte {\n\tn := len(prefix)\n\tm := len(buf)\n\tif cap(buf) < m+n {\n\t\treturn append(prefix[:n:n], buf...)\n\t} else {\n\t\tbuf = buf[:n+m]\n\t\tfor i := m - 1; i >= 0; i-- {\n\t\t\tbuf[i+n] = buf[i]\n\t\t}\n\t\tfor i := range n {\n\t\t\tbuf[i] = prefix[i]\n\t\t}\n\t\treturn buf\n\t}\n}\n\n// decodeState holds the per-call scratch buffers used by DecodeLine.\n// Instances are recycled via decodeStatePool to avoid repeated allocations\n// during high-throughput ingestion.\ntype decodeState struct {\n\t// metricBuf holds a copy of the current measurement name (line-protocol\n\t// measurement field). Copied because dec.Measurement() returns a slice\n\t// that is invalidated by the next decoder call.\n\tmetricBuf []byte\n\n\t// selector is the sub-device path passed to WriteToLevel and WALMessage\n\t// (e.g. [\"socket0\"] or [\"socket0\", \"memctrl1\"]). Reused across lines.\n\tselector []string\n\n\t// typeBuf accumulates the concatenated \"type\"+\"type-id\" tag value for the\n\t// current line. Reset at the start of each line's tag-decode loop.\n\ttypeBuf []byte\n\n\t// subTypeBuf accumulates the concatenated \"subtype\"+\"stype-id\" tag value.\n\t// Reset at the start of each line's tag-decode loop.\n\tsubTypeBuf []byte\n\n\t// prevTypeBytes / prevTypeStr cache the last seen typeBuf content and its\n\t// string conversion. Because consecutive lines in a batch typically address\n\t// the same sub-device, the cache hit rate is very high and avoids\n\t// repeated []byte→string allocations.\n\tprevTypeBytes []byte\n\tprevTypeStr   string\n\n\t// prevSubTypeBytes / prevSubTypeStr are the same cache for the subtype.\n\tprevSubTypeBytes []byte\n\tprevSubTypeStr   string\n}\n\n// decodeStatePool recycles decodeState values across DecodeLine calls to\n// reduce GC pressure during sustained metric ingestion.\nvar decodeStatePool = sync.Pool{\n\tNew: func() any {\n\t\treturn &decodeState{\n\t\t\tmetricBuf:  make([]byte, 0, 16),\n\t\t\tselector:   make([]string, 0, 4),\n\t\t\ttypeBuf:    make([]byte, 0, 16),\n\t\t\tsubTypeBuf: make([]byte, 0, 16),\n\t\t}\n\t},\n}\n\n// DecodeLine reads all lines from dec (InfluxDB line-protocol) and writes each\n// decoded metric sample into ms.\n//\n// clusterDefault is used as the cluster name for lines that do not carry a\n// \"cluster\" tag. Callers typically supply the ClusterTag value from the NATS\n// subscription configuration.\n//\n// Performance notes:\n//   - A decodeState is obtained from decodeStatePool to reuse scratch buffers.\n//   - The Level pointer (host-level node in the metric tree) is cached across\n//     consecutive lines that share the same cluster+host pair to avoid\n//     repeated lock acquisitions on the root and cluster levels.\n//   - []byte→string conversions for type/subtype selectors are cached via\n//     prevType*/prevSubType* fields because batches typically repeat the same\n//     sub-device identifiers.\n//   - Timestamp parsing tries Second precision first; if that fails it retries\n//     Millisecond, Microsecond, and Nanosecond in turn. A missing timestamp\n//     falls back to time.Now().\n//\n// When the checkpoint format is \"wal\" each successfully decoded sample is also\n// sent to WALMessages so the WAL staging goroutine can persist it durably\n// before the next binary snapshot.\nfunc DecodeLine(dec *lineprotocol.Decoder,\n\tms *MemoryStore,\n\tclusterDefault string,\n) error {\n\t// Reduce allocations in loop:\n\tt := time.Now()\n\tmetric := Metric{}\n\tst := decodeStatePool.Get().(*decodeState)\n\tdefer decodeStatePool.Put(st)\n\n\t// Optimize for the case where all lines in a \"batch\" are about the same\n\t// cluster and host. By using `WriteToLevel` (level = host), we do not need\n\t// to take the root- and cluster-level lock as often.\n\tvar lvl *Level = nil\n\tprevCluster, prevHost := \"\", \"\"\n\n\tvar ok bool\n\tfor dec.Next() {\n\t\trawmeasurement, err := dec.Measurement()\n\t\tif err != nil {\n\t\t\treturn err\n\t\t}\n\n\t\t// Needs to be copied because another call to dec.* would\n\t\t// invalidate the returned slice.\n\t\tst.metricBuf = append(st.metricBuf[:0], rawmeasurement...)\n\n\t\t// The go compiler optimizes map[string(byteslice)] lookups:\n\t\tmetric.MetricConfig, ok = ms.Metrics[string(rawmeasurement)]\n\t\tif !ok {\n\t\t\tcontinue\n\t\t}\n\n\t\tst.typeBuf, st.subTypeBuf = st.typeBuf[:0], st.subTypeBuf[:0]\n\t\tcluster, host := clusterDefault, \"\"\n\t\tfor {\n\t\t\tkey, val, err := dec.NextTag()\n\t\t\tif err != nil {\n\t\t\t\treturn err\n\t\t\t}\n\t\t\tif key == nil {\n\t\t\t\tbreak\n\t\t\t}\n\n\t\t\t// The go compiler optimizes string([]byte{...}) == \"...\":\n\t\t\tswitch string(key) {\n\t\t\tcase \"cluster\":\n\t\t\t\tif string(val) == prevCluster {\n\t\t\t\t\tcluster = prevCluster\n\t\t\t\t} else {\n\t\t\t\t\tcluster = string(val)\n\t\t\t\t\tlvl = nil\n\t\t\t\t}\n\t\t\tcase \"hostname\", \"host\":\n\t\t\t\tif string(val) == prevHost {\n\t\t\t\t\thost = prevHost\n\t\t\t\t} else {\n\t\t\t\t\thost = string(val)\n\t\t\t\t\tlvl = nil\n\t\t\t\t}\n\t\t\tcase \"type\":\n\t\t\t\tif string(val) == \"node\" {\n\t\t\t\t\tbreak\n\t\t\t\t}\n\n\t\t\t\t// We cannot be sure that the \"type\" tag comes before the \"type-id\" tag:\n\t\t\t\tif len(st.typeBuf) == 0 {\n\t\t\t\t\tst.typeBuf = append(st.typeBuf, val...)\n\t\t\t\t} else {\n\t\t\t\t\tst.typeBuf = reorder(st.typeBuf, val)\n\t\t\t\t}\n\t\t\tcase \"type-id\":\n\t\t\t\tst.typeBuf = append(st.typeBuf, val...)\n\t\t\tcase \"subtype\":\n\t\t\t\t// We cannot be sure that the \"subtype\" tag comes before the \"stype-id\" tag:\n\t\t\t\tif len(st.subTypeBuf) == 0 {\n\t\t\t\t\tst.subTypeBuf = append(st.subTypeBuf, val...)\n\t\t\t\t} else {\n\t\t\t\t\tst.subTypeBuf = reorder(st.subTypeBuf, val)\n\t\t\t\t}\n\t\t\tcase \"stype-id\":\n\t\t\t\tst.subTypeBuf = append(st.subTypeBuf, val...)\n\t\t\tdefault:\n\t\t\t}\n\t\t}\n\n\t\t// If the cluster or host changed, the lvl was set to nil\n\t\tif lvl == nil {\n\t\t\tst.selector = st.selector[:2]\n\t\t\tst.selector[0], st.selector[1] = cluster, host\n\t\t\tlvl = ms.GetLevel(st.selector)\n\t\t\tprevCluster, prevHost = cluster, host\n\t\t}\n\n\t\t// subtypes: cache []byte→string conversions; messages in a batch typically\n\t\t// share the same type/subtype so the hit rate is very high.\n\t\tst.selector = st.selector[:0]\n\t\tif len(st.typeBuf) > 0 {\n\t\t\tif !bytes.Equal(st.typeBuf, st.prevTypeBytes) {\n\t\t\t\tst.prevTypeBytes = append(st.prevTypeBytes[:0], st.typeBuf...)\n\t\t\t\tst.prevTypeStr = string(st.typeBuf)\n\t\t\t}\n\t\t\tst.selector = append(st.selector, st.prevTypeStr)\n\t\t\tif len(st.subTypeBuf) > 0 {\n\t\t\t\tif !bytes.Equal(st.subTypeBuf, st.prevSubTypeBytes) {\n\t\t\t\t\tst.prevSubTypeBytes = append(st.prevSubTypeBytes[:0], st.subTypeBuf...)\n\t\t\t\t\tst.prevSubTypeStr = string(st.subTypeBuf)\n\t\t\t\t}\n\t\t\t\tst.selector = append(st.selector, st.prevSubTypeStr)\n\t\t\t}\n\t\t}\n\n\t\tfor {\n\t\t\tkey, val, err := dec.NextField()\n\t\t\tif err != nil {\n\t\t\t\treturn err\n\t\t\t}\n\n\t\t\tif key == nil {\n\t\t\t\tbreak\n\t\t\t}\n\n\t\t\tif string(key) != \"value\" {\n\t\t\t\treturn fmt.Errorf(\"host %s: unknown field: '%s' (value: %#v)\", host, string(key), val)\n\t\t\t}\n\n\t\t\tif val.Kind() == lineprotocol.Float {\n\t\t\t\tmetric.Value = schema.Float(val.FloatV())\n\t\t\t} else if val.Kind() == lineprotocol.Int {\n\t\t\t\tmetric.Value = schema.Float(val.IntV())\n\t\t\t} else if val.Kind() == lineprotocol.Uint {\n\t\t\t\tmetric.Value = schema.Float(val.UintV())\n\t\t\t} else {\n\t\t\t\treturn fmt.Errorf(\"host %s: unsupported value type in message: %s\", host, val.Kind().String())\n\t\t\t}\n\t\t}\n\n\t\tif t, err = dec.Time(lineprotocol.Second, t); err != nil {\n\t\t\tt = time.Now()\n\t\t\tif t, err = dec.Time(lineprotocol.Millisecond, t); err != nil {\n\t\t\t\tt = time.Now()\n\t\t\t\tif t, err = dec.Time(lineprotocol.Microsecond, t); err != nil {\n\t\t\t\t\tt = time.Now()\n\t\t\t\t\tif t, err = dec.Time(lineprotocol.Nanosecond, t); err != nil {\n\t\t\t\t\t\treturn fmt.Errorf(\"host %s: timestamp : %#v with error : %#v\", host, t, err.Error())\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\n\t\tif err != nil {\n\t\t\treturn fmt.Errorf(\"host %s: timestamp : %#v with error : %#v\", host, t, err.Error())\n\t\t}\n\n\t\ttime := t.Unix()\n\n\t\tif Keys.Checkpoints.FileFormat == \"wal\" {\n\t\t\tWALMessages <- &WALMessage{\n\t\t\t\tMetricName: string(st.metricBuf),\n\t\t\t\tCluster:    cluster,\n\t\t\t\tNode:       host,\n\t\t\t\tSelector:   append([]string{}, st.selector...),\n\t\t\t\tValue:      metric.Value,\n\t\t\t\tTimestamp:  time,\n\t\t\t}\n\t\t}\n\n\t\tif err := ms.WriteToLevel(lvl, st.selector, time, []Metric{metric}); err != nil {\n\t\t\treturn err\n\t\t}\n\t}\n\treturn nil\n}\n","numLines":367,"startLine":1,"totalLines":367}},"sourceToolAssistantUUID":"e77a0811-b490-4192-92c6-cdb285981ce5","userType":"external","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"39705f8c-1691-4d60-b0aa-39f588ed9dcf","version":"2.1.74","gitBranch":"hotfix","slug":"linear-roaming-glade"}
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{"parentUuid":"c9c1e733-70ea-45bf-8b1c-0af084380e92","isSidechain":false,"promptId":"a631224c-8362-4377-bee6-9ff6c4b66c68","type":"user","message":{"role":"user","content":[{"tool_use_id":"toolu_01JAQD1WnGapbNbL9C3hopCB","type":"tool_result","content":"     1→// Copyright (C) NHR@FAU, University Erlangen-Nuremberg.\n     2→// All rights reserved. This file is part of cc-backend.\n     3→// Use of this source code is governed by a MIT-style\n     4→// license that can be found in the LICENSE file.\n     5→\n     6→// Package metricstore provides level.go: Hierarchical tree structure for metric storage.\n     7→//\n     8→// # Level Architecture\n     9→//\n    10→// The Level type forms a tree structure where each node represents a level in the\n    11→// ClusterCockpit hierarchy: cluster → host → socket → core → hwthread, with special\n    12→// nodes for memory domains and accelerators.\n    13→//\n    14→// Structure:\n    15→//\n    16→//\tRoot Level (cluster=\"emmy\")\n    17→//\t├─ Level (host=\"node001\")\n    18→//\t│  ├─ Level (socket=\"0\")\n    19→//\t│  │  ├─ Level (core=\"0\") [stores cpu0 metrics]\n    20→//\t│  │  └─ Level (core=\"1\") [stores cpu1 metrics]\n    21→//\t│  └─ Level (socket=\"1\")\n    22→//\t│     └─ ...\n    23→//\t└─ Level (host=\"node002\")\n    24→//\t   └─ ...\n    25→//\n    26→// Each Level can:\n    27→//   - Hold data (metrics slice of buffer pointers)\n    28→//   - Have child nodes (children map[string]*Level)\n    29→//   - Both simultaneously (inner nodes can store aggregated metrics)\n    30→//\n    31→// # Selector Paths\n    32→//\n    33→// Selectors are hierarchical paths: []string{\"cluster\", \"host\", \"component\"}.\n    34→// Example: []string{\"emmy\", \"node001\", \"cpu0\"} navigates to the cpu0 core level.\n    35→//\n    36→// # Concurrency\n    37→//\n    38→// RWMutex protects children map and metrics slice. Read-heavy workload (metric reads)\n    39→// uses RLock. Writes (new levels, buffer updates) use Lock. Double-checked locking\n    40→// prevents races during level creation.\n    41→package metricstore\n    42→\n    43→import (\n    44→\t\"sync\"\n    45→\t\"time\"\n    46→\t\"unsafe\"\n    47→\n    48→\t\"github.com/ClusterCockpit/cc-lib/v2/schema\"\n    49→\t\"github.com/ClusterCockpit/cc-lib/v2/util\"\n    50→)\n    51→\n    52→// Level represents a node in the hierarchical metric storage tree.\n    53→//\n    54→// Can be both a leaf or inner node. Inner nodes hold data in 'metrics' for aggregated\n    55→// values (e.g., socket-level metrics derived from core-level data). Named \"Level\"\n    56→// instead of \"node\" to avoid confusion with cluster nodes (hosts).\n    57→//\n    58→// Fields:\n    59→//   - children: Map of child level names to Level pointers (e.g., \"cpu0\" → Level)\n    60→//   - metrics:  Slice of buffer pointers (one per metric, indexed by MetricConfig.offset)\n    61→//   - lock:     RWMutex for concurrent access (read-heavy, write-rare)\n    62→type Level struct {\n    63→\tchildren map[string]*Level\n    64→\tmetrics  []*buffer\n    65→\tlock     sync.RWMutex\n    66→}\n    67→\n    68→// findLevelOrCreate navigates to or creates the level specified by selector.\n    69→//\n    70→// Recursively descends the tree, creating missing levels as needed. Uses double-checked\n    71→// locking: RLock first (fast path), then Lock if creation needed (slow path), then\n    72→// re-check after acquiring Lock to handle races.\n    73→//\n    74→// Example selector: []string{\"emmy\", \"node001\", \"cpu0\"}\n    75→// Navigates: root → emmy → node001 → cpu0, creating levels as needed.\n    76→//\n    77→// Parameters:\n    78→//   - selector: Hierarchical path (consumed recursively, decreasing depth)\n    79→//   - nMetrics: Number of metric slots to allocate in new levels\n    80→//\n    81→// Returns:\n    82→//   - *Level: The target level (existing or newly created)\n    83→//\n    84→// Note: sync.Map may improve performance for high-concurrency writes, but current\n    85→// approach suffices for read-heavy workload.\n    86→func (l *Level) findLevelOrCreate(selector []string, nMetrics int) *Level {\n    87→\tif len(selector) == 0 {\n    88→\t\treturn l\n    89→\t}\n    90→\n    91→\t// Allow concurrent reads:\n    92→\tl.lock.RLock()\n    93→\tvar child *Level\n    94→\tvar ok bool\n    95→\tif l.children == nil {\n    96→\t\t// Children map needs to be created...\n    97→\t\tl.lock.RUnlock()\n    98→\t} else {\n    99→\t\tchild, ok = l.children[selector[0]]\n   100→\t\tl.lock.RUnlock()\n   101→\t\tif ok {\n   102→\t\t\treturn child.findLevelOrCreate(selector[1:], nMetrics)\n   103→\t\t}\n   104→\t}\n   105→\n   106→\t// The level does not exist, take write lock for unique access:\n   107→\tl.lock.Lock()\n   108→\t// While this thread waited for the write lock, another thread\n   109→\t// could have created the child node.\n   110→\tif l.children != nil {\n   111→\t\tchild, ok = l.children[selector[0]]\n   112→\t\tif ok {\n   113→\t\t\tl.lock.Unlock()\n   114→\t\t\treturn child.findLevelOrCreate(selector[1:], nMetrics)\n   115→\t\t}\n   116→\t}\n   117→\n   118→\tchild = &Level{\n   119→\t\tmetrics:  make([]*buffer, nMetrics),\n   120→\t\tchildren: nil,\n   121→\t}\n   122→\n   123→\tif l.children != nil {\n   124→\t\tl.children[selector[0]] = child\n   125→\t} else {\n   126→\t\tl.children = map[string]*Level{selector[0]: child}\n   127→\t}\n   128→\tl.lock.Unlock()\n   129→\treturn child.findLevelOrCreate(selector[1:], nMetrics)\n   130→}\n   131→\n   132→// collectPaths gathers all selector paths at the specified depth in the tree.\n   133→//\n   134→// Recursively traverses children, collecting paths when currentDepth+1 == targetDepth.\n   135→// Each path is a selector that can be used with findLevel() or findBuffers().\n   136→//\n   137→// Explicitly copies slices to avoid shared underlying arrays between siblings, preventing\n   138→// unintended mutations.\n   139→//\n   140→// Parameters:\n   141→//   - currentDepth: Depth of current level (0 = root)\n   142→//   - targetDepth:  Depth to collect paths from\n   143→//   - currentPath:  Path accumulated so far\n   144→//   - results:      Output slice (appended to)\n   145→//\n   146→// Example: collectPaths(0, 2, []string{}, &results) collects all 2-level paths\n   147→// like []string{\"emmy\", \"node001\"}, []string{\"emmy\", \"node002\"}, etc.\n   148→func (l *Level) collectPaths(currentDepth, targetDepth int, currentPath []string, results *[][]string) {\n   149→\tl.lock.RLock()\n   150→\tdefer l.lock.RUnlock()\n   151→\n   152→\tfor key, child := range l.children {\n   153→\t\tif child == nil {\n   154→\t\t\tcontinue\n   155→\t\t}\n   156→\n   157→\t\t// We explicitly make a new slice and copy data to avoid sharing underlying arrays between siblings\n   158→\t\tnewPath := make([]string, len(currentPath))\n   159→\t\tcopy(newPath, currentPath)\n   160→\t\tnewPath = append(newPath, key)\n   161→\n   162→\t\t// Check depth, and just return if depth reached\n   163→\t\tif currentDepth+1 == targetDepth {\n   164→\t\t\t*results = append(*results, newPath)\n   165→\t\t} else {\n   166→\t\t\tchild.collectPaths(currentDepth+1, targetDepth, newPath, results)\n   167→\t\t}\n   168→\t}\n   169→}\n   170→\n   171→// free removes buffers older than the retention threshold from the entire subtree.\n   172→//\n   173→// Recursively frees buffers in this level's metrics and all child levels. Buffers\n   174→// with standard capacity (BufferCap) are returned to the pool. Called by the\n   175→// retention worker to enforce retention policies.\n   176→//\n   177→// Parameters:\n   178→//   - t: Retention threshold timestamp (Unix seconds)\n   179→//\n   180→// Returns:\n   181→//   - int:   Total number of buffers freed in this subtree\n   182→//   - error: Non-nil on failure (propagated from children)\n   183→func (l *Level) free(t int64) (int, error) {\n   184→\tl.lock.Lock()\n   185→\tdefer l.lock.Unlock()\n   186→\n   187→\tn := 0\n   188→\tfor i, b := range l.metrics {\n   189→\t\tif b != nil {\n   190→\t\t\tdelme, m := b.free(t)\n   191→\t\t\tn += m\n   192→\t\t\tif delme {\n   193→\t\t\t\tif cap(b.data) != BufferCap {\n   194→\t\t\t\t\tb.data = make([]schema.Float, 0, BufferCap)\n   195→\t\t\t\t}\n   196→\t\t\t\tb.lastUsed = time.Now().Unix()\n   197→\t\t\t\tbufferPool.Put(b)\n   198→\t\t\t\tl.metrics[i] = nil\n   199→\t\t\t}\n   200→\t\t}\n   201→\t}\n   202→\n   203→\tfor _, l := range l.children {\n   204→\t\tm, err := l.free(t)\n   205→\t\tn += m\n   206→\t\tif err != nil {\n   207→\t\t\treturn n, err\n   208→\t\t}\n   209→\t}\n   210→\n   211→\treturn n, nil\n   212→}\n   213→\n   214→// forceFree removes the oldest buffer from each metric chain in the subtree.\n   215→//\n   216→// Unlike free(), which removes based on time threshold, this unconditionally removes\n   217→// the oldest buffer in each chain. Used by MemoryUsageTracker when memory cap is\n   218→// exceeded and time-based retention is insufficient.\n   219→//\n   220→// Recursively processes current level's metrics and all child levels.\n   221→//\n   222→// Returns:\n   223→//   - int:   Total number of buffers freed in this subtree\n   224→//   - error: Non-nil on failure (propagated from children)\n   225→func (l *Level) forceFree() (int, error) {\n   226→\tl.lock.Lock()\n   227→\tdefer l.lock.Unlock()\n   228→\n   229→\tn := 0\n   230→\n   231→\t// Iterate over metrics in the current level\n   232→\tfor i, b := range l.metrics {\n   233→\t\tif b != nil {\n   234→\t\t\t// Attempt to free the oldest buffer in this chain\n   235→\t\t\tdelme, freedCount := b.forceFreeOldest()\n   236→\t\t\tn += freedCount\n   237→\n   238→\t\t\t// If delme is true, it means 'b' itself (the head) was the oldest\n   239→\t\t\t// and needs to be removed from the slice.\n   240→\t\t\tif delme {\n   241→\t\t\t\tb.next = nil\n   242→\t\t\t\tb.prev = nil\n   243→\t\t\t\tif cap(b.data) != BufferCap {\n   244→\t\t\t\t\tb.data = make([]schema.Float, 0, BufferCap)\n   245→\t\t\t\t}\n   246→\t\t\t\tb.lastUsed = time.Now().Unix()\n   247→\t\t\t\tbufferPool.Put(b)\n   248→\t\t\t\tl.metrics[i] = nil\n   249→\t\t\t}\n   250→\t\t}\n   251→\t}\n   252→\n   253→\t// Recursively traverse children\n   254→\tfor _, child := range l.children {\n   255→\t\tm, err := child.forceFree()\n   256→\t\tn += m\n   257→\t\tif err != nil {\n   258→\t\t\treturn n, err\n   259→\t\t}\n   260→\t}\n   261→\n   262→\treturn n, nil\n   263→}\n   264→\n   265→// sizeInBytes calculates the total memory usage of all buffers in the subtree.\n   266→//\n   267→// Recursively sums buffer data sizes (count of Float values × sizeof(Float)) across\n   268→// this level's metrics and all child levels. Used by MemoryUsageTracker to enforce\n   269→// memory cap limits.\n   270→//\n   271→// Returns:\n   272→//   - int64: Total bytes used by buffer data in this subtree\n   273→func (l *Level) sizeInBytes() int64 {\n   274→\tl.lock.RLock()\n   275→\tdefer l.lock.RUnlock()\n   276→\tsize := int64(0)\n   277→\n   278→\tfor _, b := range l.metrics {\n   279→\t\tif b != nil {\n   280→\t\t\tsize += b.count() * int64(unsafe.Sizeof(schema.Float(0)))\n   281→\t\t}\n   282→\t}\n   283→\n   284→\tfor _, child := range l.children {\n   285→\t\tsize += child.sizeInBytes()\n   286→\t}\n   287→\n   288→\treturn size\n   289→}\n   290→\n   291→// findLevel navigates to the level specified by selector, returning nil if not found.\n   292→//\n   293→// Read-only variant of findLevelOrCreate. Does not create missing levels.\n   294→// Recursively descends the tree following the selector path.\n   295→//\n   296→// Parameters:\n   297→//   - selector: Hierarchical path (e.g., []string{\"emmy\", \"node001\", \"cpu0\"})\n   298→//\n   299→// Returns:\n   300→//   - *Level: The target level, or nil if any component in the path does not exist\n   301→func (l *Level) findLevel(selector []string) *Level {\n   302→\tif len(selector) == 0 {\n   303→\t\treturn l\n   304→\t}\n   305→\n   306→\tl.lock.RLock()\n   307→\tdefer l.lock.RUnlock()\n   308→\n   309→\tlvl := l.children[selector[0]]\n   310→\tif lvl == nil {\n   311→\t\treturn nil\n   312→\t}\n   313→\n   314→\treturn lvl.findLevel(selector[1:])\n   315→}\n   316→\n   317→// findBuffers invokes callback on all buffers matching the selector pattern.\n   318→//\n   319→// Supports flexible selector patterns (from cc-lib/util.Selector):\n   320→//   - Exact match: Selector element with String set (e.g., \"node001\")\n   321→//   - Group match: Selector element with Group set (e.g., [\"cpu0\", \"cpu2\", \"cpu4\"])\n   322→//   - Wildcard:    Selector element with Any=true (matches all children)\n   323→//\n   324→// Empty selector (len==0) matches current level's buffer at 'offset' and recursively\n   325→// all descendant buffers at the same offset (used for aggregation queries).\n   326→//\n   327→// Parameters:\n   328→//   - selector: Pattern to match (consumed recursively)\n   329→//   - offset:   Metric index in metrics slice (from MetricConfig.offset)\n   330→//   - f:        Callback invoked on each matching buffer\n   331→//\n   332→// Returns:\n   333→//   - error: First error returned by callback, or nil if all succeeded\n   334→//\n   335→// Example:\n   336→//\n   337→//\t// Find all cpu0 buffers across all hosts:\n   338→//\tfindBuffers([]Selector{{Any: true}, {String: \"cpu0\"}}, metricOffset, callback)\n   339→func (l *Level) findBuffers(selector util.Selector, offset int, f func(b *buffer) error) error {\n   340→\tl.lock.RLock()\n   341→\tdefer l.lock.RUnlock()\n   342→\n   343→\tif len(selector) == 0 {\n   344→\t\tb := l.metrics[offset]\n   345→\t\tif b != nil {\n   346→\t\t\treturn f(b)\n   347→\t\t}\n   348→\n   349→\t\tfor _, lvl := range l.children {\n   350→\t\t\terr := lvl.findBuffers(nil, offset, f)\n   351→\t\t\tif err != nil {\n   352→\t\t\t\treturn err\n   353→\t\t\t}\n   354→\t\t}\n   355→\t\treturn nil\n   356→\t}\n   357→\n   358→\tsel := selector[0]\n   359→\tif len(sel.String) != 0 && l.children != nil {\n   360→\t\tlvl, ok := l.children[sel.String]\n   361→\t\tif ok {\n   362→\t\t\terr := lvl.findBuffers(selector[1:], offset, f)\n   363→\t\t\tif err != nil {\n   364→\t\t\t\treturn err\n   365→\t\t\t}\n   366→\t\t}\n   367→\t\treturn nil\n   368→\t}\n   369→\n   370→\tif sel.Group != nil && l.children != nil {\n   371→\t\tfor _, key := range sel.Group {\n   372→\t\t\tlvl, ok := l.children[key]\n   373→\t\t\tif ok {\n   374→\t\t\t\terr := lvl.findBuffers(selector[1:], offset, f)\n   375→\t\t\t\tif err != nil {\n   376→\t\t\t\t\treturn err\n   377→\t\t\t\t}\n   378→\t\t\t}\n   379→\t\t}\n   380→\t\treturn nil\n   381→\t}\n   382→\n   383→\tif sel.Any && l.children != nil {\n   384→\t\tfor _, lvl := range l.children {\n   385→\t\t\tif err := lvl.findBuffers(selector[1:], offset, f); err != nil {\n   386→\t\t\t\treturn err\n   387→\t\t\t}\n   388→\t\t}\n   389→\t\treturn nil\n   390→\t}\n   391→\n   392→\treturn nil\n   393→}\n   394→"}]},"uuid":"0a4e3ab3-23c6-401d-8326-064ff842407b","timestamp":"2026-03-13T06:51:39.714Z","toolUseResult":{"type":"text","file":{"filePath":"/Users/jan/prg/ClusterCockpit/cc-backend/pkg/metricstore/level.go","content":"// Copyright (C) NHR@FAU, University Erlangen-Nuremberg.\n// All rights reserved. This file is part of cc-backend.\n// Use of this source code is governed by a MIT-style\n// license that can be found in the LICENSE file.\n\n// Package metricstore provides level.go: Hierarchical tree structure for metric storage.\n//\n// # Level Architecture\n//\n// The Level type forms a tree structure where each node represents a level in the\n// ClusterCockpit hierarchy: cluster → host → socket → core → hwthread, with special\n// nodes for memory domains and accelerators.\n//\n// Structure:\n//\n//\tRoot Level (cluster=\"emmy\")\n//\t├─ Level (host=\"node001\")\n//\t│  ├─ Level (socket=\"0\")\n//\t│  │  ├─ Level (core=\"0\") [stores cpu0 metrics]\n//\t│  │  └─ Level (core=\"1\") [stores cpu1 metrics]\n//\t│  └─ Level (socket=\"1\")\n//\t│     └─ ...\n//\t└─ Level (host=\"node002\")\n//\t   └─ ...\n//\n// Each Level can:\n//   - Hold data (metrics slice of buffer pointers)\n//   - Have child nodes (children map[string]*Level)\n//   - Both simultaneously (inner nodes can store aggregated metrics)\n//\n// # Selector Paths\n//\n// Selectors are hierarchical paths: []string{\"cluster\", \"host\", \"component\"}.\n// Example: []string{\"emmy\", \"node001\", \"cpu0\"} navigates to the cpu0 core level.\n//\n// # Concurrency\n//\n// RWMutex protects children map and metrics slice. Read-heavy workload (metric reads)\n// uses RLock. Writes (new levels, buffer updates) use Lock. Double-checked locking\n// prevents races during level creation.\npackage metricstore\n\nimport (\n\t\"sync\"\n\t\"time\"\n\t\"unsafe\"\n\n\t\"github.com/ClusterCockpit/cc-lib/v2/schema\"\n\t\"github.com/ClusterCockpit/cc-lib/v2/util\"\n)\n\n// Level represents a node in the hierarchical metric storage tree.\n//\n// Can be both a leaf or inner node. Inner nodes hold data in 'metrics' for aggregated\n// values (e.g., socket-level metrics derived from core-level data). Named \"Level\"\n// instead of \"node\" to avoid confusion with cluster nodes (hosts).\n//\n// Fields:\n//   - children: Map of child level names to Level pointers (e.g., \"cpu0\" → Level)\n//   - metrics:  Slice of buffer pointers (one per metric, indexed by MetricConfig.offset)\n//   - lock:     RWMutex for concurrent access (read-heavy, write-rare)\ntype Level struct {\n\tchildren map[string]*Level\n\tmetrics  []*buffer\n\tlock     sync.RWMutex\n}\n\n// findLevelOrCreate navigates to or creates the level specified by selector.\n//\n// Recursively descends the tree, creating missing levels as needed. Uses double-checked\n// locking: RLock first (fast path), then Lock if creation needed (slow path), then\n// re-check after acquiring Lock to handle races.\n//\n// Example selector: []string{\"emmy\", \"node001\", \"cpu0\"}\n// Navigates: root → emmy → node001 → cpu0, creating levels as needed.\n//\n// Parameters:\n//   - selector: Hierarchical path (consumed recursively, decreasing depth)\n//   - nMetrics: Number of metric slots to allocate in new levels\n//\n// Returns:\n//   - *Level: The target level (existing or newly created)\n//\n// Note: sync.Map may improve performance for high-concurrency writes, but current\n// approach suffices for read-heavy workload.\nfunc (l *Level) findLevelOrCreate(selector []string, nMetrics int) *Level {\n\tif len(selector) == 0 {\n\t\treturn l\n\t}\n\n\t// Allow concurrent reads:\n\tl.lock.RLock()\n\tvar child *Level\n\tvar ok bool\n\tif l.children == nil {\n\t\t// Children map needs to be created...\n\t\tl.lock.RUnlock()\n\t} else {\n\t\tchild, ok = l.children[selector[0]]\n\t\tl.lock.RUnlock()\n\t\tif ok {\n\t\t\treturn child.findLevelOrCreate(selector[1:], nMetrics)\n\t\t}\n\t}\n\n\t// The level does not exist, take write lock for unique access:\n\tl.lock.Lock()\n\t// While this thread waited for the write lock, another thread\n\t// could have created the child node.\n\tif l.children != nil {\n\t\tchild, ok = l.children[selector[0]]\n\t\tif ok {\n\t\t\tl.lock.Unlock()\n\t\t\treturn child.findLevelOrCreate(selector[1:], nMetrics)\n\t\t}\n\t}\n\n\tchild = &Level{\n\t\tmetrics:  make([]*buffer, nMetrics),\n\t\tchildren: nil,\n\t}\n\n\tif l.children != nil {\n\t\tl.children[selector[0]] = child\n\t} else {\n\t\tl.children = map[string]*Level{selector[0]: child}\n\t}\n\tl.lock.Unlock()\n\treturn child.findLevelOrCreate(selector[1:], nMetrics)\n}\n\n// collectPaths gathers all selector paths at the specified depth in the tree.\n//\n// Recursively traverses children, collecting paths when currentDepth+1 == targetDepth.\n// Each path is a selector that can be used with findLevel() or findBuffers().\n//\n// Explicitly copies slices to avoid shared underlying arrays between siblings, preventing\n// unintended mutations.\n//\n// Parameters:\n//   - currentDepth: Depth of current level (0 = root)\n//   - targetDepth:  Depth to collect paths from\n//   - currentPath:  Path accumulated so far\n//   - results:      Output slice (appended to)\n//\n// Example: collectPaths(0, 2, []string{}, &results) collects all 2-level paths\n// like []string{\"emmy\", \"node001\"}, []string{\"emmy\", \"node002\"}, etc.\nfunc (l *Level) collectPaths(currentDepth, targetDepth int, currentPath []string, results *[][]string) {\n\tl.lock.RLock()\n\tdefer l.lock.RUnlock()\n\n\tfor key, child := range l.children {\n\t\tif child == nil {\n\t\t\tcontinue\n\t\t}\n\n\t\t// We explicitly make a new slice and copy data to avoid sharing underlying arrays between siblings\n\t\tnewPath := make([]string, len(currentPath))\n\t\tcopy(newPath, currentPath)\n\t\tnewPath = append(newPath, key)\n\n\t\t// Check depth, and just return if depth reached\n\t\tif currentDepth+1 == targetDepth {\n\t\t\t*results = append(*results, newPath)\n\t\t} else {\n\t\t\tchild.collectPaths(currentDepth+1, targetDepth, newPath, results)\n\t\t}\n\t}\n}\n\n// free removes buffers older than the retention threshold from the entire subtree.\n//\n// Recursively frees buffers in this level's metrics and all child levels. Buffers\n// with standard capacity (BufferCap) are returned to the pool. Called by the\n// retention worker to enforce retention policies.\n//\n// Parameters:\n//   - t: Retention threshold timestamp (Unix seconds)\n//\n// Returns:\n//   - int:   Total number of buffers freed in this subtree\n//   - error: Non-nil on failure (propagated from children)\nfunc (l *Level) free(t int64) (int, error) {\n\tl.lock.Lock()\n\tdefer l.lock.Unlock()\n\n\tn := 0\n\tfor i, b := range l.metrics {\n\t\tif b != nil {\n\t\t\tdelme, m := b.free(t)\n\t\t\tn += m\n\t\t\tif delme {\n\t\t\t\tif cap(b.data) != BufferCap {\n\t\t\t\t\tb.data = make([]schema.Float, 0, BufferCap)\n\t\t\t\t}\n\t\t\t\tb.lastUsed = time.Now().Unix()\n\t\t\t\tbufferPool.Put(b)\n\t\t\t\tl.metrics[i] = nil\n\t\t\t}\n\t\t}\n\t}\n\n\tfor _, l := range l.children {\n\t\tm, err := l.free(t)\n\t\tn += m\n\t\tif err != nil {\n\t\t\treturn n, err\n\t\t}\n\t}\n\n\treturn n, nil\n}\n\n// forceFree removes the oldest buffer from each metric chain in the subtree.\n//\n// Unlike free(), which removes based on time threshold, this unconditionally removes\n// the oldest buffer in each chain. Used by MemoryUsageTracker when memory cap is\n// exceeded and time-based retention is insufficient.\n//\n// Recursively processes current level's metrics and all child levels.\n//\n// Returns:\n//   - int:   Total number of buffers freed in this subtree\n//   - error: Non-nil on failure (propagated from children)\nfunc (l *Level) forceFree() (int, error) {\n\tl.lock.Lock()\n\tdefer l.lock.Unlock()\n\n\tn := 0\n\n\t// Iterate over metrics in the current level\n\tfor i, b := range l.metrics {\n\t\tif b != nil {\n\t\t\t// Attempt to free the oldest buffer in this chain\n\t\t\tdelme, freedCount := b.forceFreeOldest()\n\t\t\tn += freedCount\n\n\t\t\t// If delme is true, it means 'b' itself (the head) was the oldest\n\t\t\t// and needs to be removed from the slice.\n\t\t\tif delme {\n\t\t\t\tb.next = nil\n\t\t\t\tb.prev = nil\n\t\t\t\tif cap(b.data) != BufferCap {\n\t\t\t\t\tb.data = make([]schema.Float, 0, BufferCap)\n\t\t\t\t}\n\t\t\t\tb.lastUsed = time.Now().Unix()\n\t\t\t\tbufferPool.Put(b)\n\t\t\t\tl.metrics[i] = nil\n\t\t\t}\n\t\t}\n\t}\n\n\t// Recursively traverse children\n\tfor _, child := range l.children {\n\t\tm, err := child.forceFree()\n\t\tn += m\n\t\tif err != nil {\n\t\t\treturn n, err\n\t\t}\n\t}\n\n\treturn n, nil\n}\n\n// sizeInBytes calculates the total memory usage of all buffers in the subtree.\n//\n// Recursively sums buffer data sizes (count of Float values × sizeof(Float)) across\n// this level's metrics and all child levels. Used by MemoryUsageTracker to enforce\n// memory cap limits.\n//\n// Returns:\n//   - int64: Total bytes used by buffer data in this subtree\nfunc (l *Level) sizeInBytes() int64 {\n\tl.lock.RLock()\n\tdefer l.lock.RUnlock()\n\tsize := int64(0)\n\n\tfor _, b := range l.metrics {\n\t\tif b != nil {\n\t\t\tsize += b.count() * int64(unsafe.Sizeof(schema.Float(0)))\n\t\t}\n\t}\n\n\tfor _, child := range l.children {\n\t\tsize += child.sizeInBytes()\n\t}\n\n\treturn size\n}\n\n// findLevel navigates to the level specified by selector, returning nil if not found.\n//\n// Read-only variant of findLevelOrCreate. Does not create missing levels.\n// Recursively descends the tree following the selector path.\n//\n// Parameters:\n//   - selector: Hierarchical path (e.g., []string{\"emmy\", \"node001\", \"cpu0\"})\n//\n// Returns:\n//   - *Level: The target level, or nil if any component in the path does not exist\nfunc (l *Level) findLevel(selector []string) *Level {\n\tif len(selector) == 0 {\n\t\treturn l\n\t}\n\n\tl.lock.RLock()\n\tdefer l.lock.RUnlock()\n\n\tlvl := l.children[selector[0]]\n\tif lvl == nil {\n\t\treturn nil\n\t}\n\n\treturn lvl.findLevel(selector[1:])\n}\n\n// findBuffers invokes callback on all buffers matching the selector pattern.\n//\n// Supports flexible selector patterns (from cc-lib/util.Selector):\n//   - Exact match: Selector element with String set (e.g., \"node001\")\n//   - Group match: Selector element with Group set (e.g., [\"cpu0\", \"cpu2\", \"cpu4\"])\n//   - Wildcard:    Selector element with Any=true (matches all children)\n//\n// Empty selector (len==0) matches current level's buffer at 'offset' and recursively\n// all descendant buffers at the same offset (used for aggregation queries).\n//\n// Parameters:\n//   - selector: Pattern to match (consumed recursively)\n//   - offset:   Metric index in metrics slice (from MetricConfig.offset)\n//   - f:        Callback invoked on each matching buffer\n//\n// Returns:\n//   - error: First error returned by callback, or nil if all succeeded\n//\n// Example:\n//\n//\t// Find all cpu0 buffers across all hosts:\n//\tfindBuffers([]Selector{{Any: true}, {String: \"cpu0\"}}, metricOffset, callback)\nfunc (l *Level) findBuffers(selector util.Selector, offset int, f func(b *buffer) error) error {\n\tl.lock.RLock()\n\tdefer l.lock.RUnlock()\n\n\tif len(selector) == 0 {\n\t\tb := l.metrics[offset]\n\t\tif b != nil {\n\t\t\treturn f(b)\n\t\t}\n\n\t\tfor _, lvl := range l.children {\n\t\t\terr := lvl.findBuffers(nil, offset, f)\n\t\t\tif err != nil {\n\t\t\t\treturn err\n\t\t\t}\n\t\t}\n\t\treturn nil\n\t}\n\n\tsel := selector[0]\n\tif len(sel.String) != 0 && l.children != nil {\n\t\tlvl, ok := l.children[sel.String]\n\t\tif ok {\n\t\t\terr := lvl.findBuffers(selector[1:], offset, f)\n\t\t\tif err != nil {\n\t\t\t\treturn err\n\t\t\t}\n\t\t}\n\t\treturn nil\n\t}\n\n\tif sel.Group != nil && l.children != nil {\n\t\tfor _, key := range sel.Group {\n\t\t\tlvl, ok := l.children[key]\n\t\t\tif ok {\n\t\t\t\terr := lvl.findBuffers(selector[1:], offset, f)\n\t\t\t\tif err != nil {\n\t\t\t\t\treturn err\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t\treturn nil\n\t}\n\n\tif sel.Any && l.children != nil {\n\t\tfor _, lvl := range l.children {\n\t\t\tif err := lvl.findBuffers(selector[1:], offset, f); err != nil {\n\t\t\t\treturn err\n\t\t\t}\n\t\t}\n\t\treturn nil\n\t}\n\n\treturn nil\n}\n","numLines":394,"startLine":1,"totalLines":394}},"sourceToolAssistantUUID":"c9c1e733-70ea-45bf-8b1c-0af084380e92","userType":"external","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"39705f8c-1691-4d60-b0aa-39f588ed9dcf","version":"2.1.74","gitBranch":"hotfix","slug":"linear-roaming-glade"}
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{"parentUuid":"46ca9b63-5718-455b-abef-764e1ad29322","isSidechain":false,"promptId":"a631224c-8362-4377-bee6-9ff6c4b66c68","type":"user","message":{"role":"user","content":[{"tool_use_id":"toolu_01N58SqTvoihL8LCJnL8EAKP","type":"tool_result","content":"     1→// Copyright (C) NHR@FAU, University Erlangen-Nuremberg.\n     2→// All rights reserved. This file is part of cc-backend.\n     3→// Use of this source code is governed by a MIT-style\n     4→// license that can be found in the LICENSE file.\n     5→\n     6→// Package metricstore provides buffer.go: Time-series data buffer implementation.\n     7→//\n     8→// # Buffer Architecture\n     9→//\n    10→// Each metric at each hierarchical level (cluster/host/cpu/etc.) uses a linked-list\n    11→// chain of fixed-size buffers to store time-series data. This design:\n    12→//\n    13→//   - Avoids reallocation/copying when growing (new links added instead)\n    14→//   - Enables efficient pooling (buffers returned to sync.Pool)\n    15→//   - Supports traversal back in time (via prev pointers)\n    16→//   - Maintains temporal ordering (newer data in later buffers)\n    17→//\n    18→// # Buffer Chain Example\n    19→//\n    20→//\t[oldest buffer] <- prev -- [older] <- prev -- [newest buffer (head)]\n    21→//\t  start=1000               start=1512           start=2024\n    22→//\t  data=[v0...v511]         data=[v0...v511]     data=[v0...v42]\n    23→//\n    24→// When the head buffer reaches capacity (BufferCap = 512), a new buffer becomes\n    25→// the new head and the old head is linked via prev.\n    26→//\n    27→// # Pooling Strategy\n    28→//\n    29→// sync.Pool reduces GC pressure for the common case (BufferCap-sized allocations).\n    30→// Non-standard capacity buffers are not pooled (e.g., from checkpoint deserialization).\n    31→//\n    32→// # Time Alignment\n    33→//\n    34→// Timestamps are aligned to measurement frequency intervals:\n    35→//\n    36→//\tindex = (timestamp - buffer.start) / buffer.frequency\n    37→//\tactualTime = buffer.start + (frequency / 2) + (index * frequency)\n    38→//\n    39→// Missing data points are represented as NaN values. The read() function performs\n    40→// linear interpolation where possible.\n    41→package metricstore\n    42→\n    43→import (\n    44→\t\"errors\"\n    45→\t\"sync\"\n    46→\t\"time\"\n    47→\n    48→\t\"github.com/ClusterCockpit/cc-lib/v2/schema\"\n    49→)\n    50→\n    51→// BufferCap is the default buffer capacity.\n    52→// buffer.data will only ever grow up to its capacity and a new link\n    53→// in the buffer chain will be created if needed so that no copying\n    54→// of data or reallocation needs to happen on writes.\n    55→const BufferCap int = DefaultBufferCapacity\n    56→\n    57→// BufferPool is the global instance.\n    58→// It is initialized immediately when the package loads.\n    59→var bufferPool = NewPersistentBufferPool()\n    60→\n    61→type PersistentBufferPool struct {\n    62→\tpool []*buffer\n    63→\tmu   sync.Mutex\n    64→}\n    65→\n    66→// NewPersistentBufferPool creates a dynamic pool for buffers.\n    67→func NewPersistentBufferPool() *PersistentBufferPool {\n    68→\treturn &PersistentBufferPool{\n    69→\t\tpool: make([]*buffer, 0),\n    70→\t}\n    71→}\n    72→\n    73→func (p *PersistentBufferPool) Get() *buffer {\n    74→\tp.mu.Lock()\n    75→\tdefer p.mu.Unlock()\n    76→\n    77→\tn := len(p.pool)\n    78→\tif n == 0 {\n    79→\t\t// Pool is empty, allocate a new one\n    80→\t\treturn &buffer{\n    81→\t\t\tdata: make([]schema.Float, 0, BufferCap),\n    82→\t\t}\n    83→\t}\n    84→\n    85→\t// Reuse existing buffer from the pool\n    86→\tb := p.pool[n-1]\n    87→\tp.pool[n-1] = nil // Avoid memory leak\n    88→\tp.pool = p.pool[:n-1]\n    89→\treturn b\n    90→}\n    91→\n    92→// Put returns b to the pool. The caller must set b.lastUsed = time.Now().Unix()\n    93→// before calling Put so that Clean() can evict idle entries correctly.\n    94→func (p *PersistentBufferPool) Put(b *buffer) {\n    95→\t// Reset the buffer before putting it back\n    96→\tb.data = b.data[:0]\n    97→\n    98→\tp.mu.Lock()\n    99→\tdefer p.mu.Unlock()\n   100→\n   101→\tp.pool = append(p.pool, b)\n   102→}\n   103→\n   104→// GetSize returns the exact number of buffers currently sitting in the pool.\n   105→func (p *PersistentBufferPool) GetSize() int {\n   106→\tp.mu.Lock()\n   107→\tdefer p.mu.Unlock()\n   108→\treturn len(p.pool)\n   109→}\n   110→\n   111→// Clear drains all buffers currently in the pool, allowing the GC to collect them.\n   112→func (p *PersistentBufferPool) Clear() {\n   113→\tp.mu.Lock()\n   114→\tdefer p.mu.Unlock()\n   115→\tfor i := range p.pool {\n   116→\t\tp.pool[i] = nil\n   117→\t}\n   118→\tp.pool = p.pool[:0]\n   119→}\n   120→\n   121→// Clean removes buffers from the pool that haven't been used in the given duration.\n   122→// It uses a simple LRU approach based on the lastUsed timestamp.\n   123→func (p *PersistentBufferPool) Clean(threshold int64) {\n   124→\tp.mu.Lock()\n   125→\tdefer p.mu.Unlock()\n   126→\n   127→\t// Filter in place, retaining only buffers returned to the pool recently enough.\n   128→\tactive := p.pool[:0]\n   129→\tfor _, b := range p.pool {\n   130→\t\tif b.lastUsed >= threshold {\n   131→\t\t\tactive = append(active, b)\n   132→\t\t}\n   133→\t}\n   134→\n   135→\t// Nullify the rest to prevent memory leaks\n   136→\tfor i := len(active); i < len(p.pool); i++ {\n   137→\t\tp.pool[i] = nil\n   138→\t}\n   139→\n   140→\tp.pool = active\n   141→}\n   142→\n   143→var (\n   144→\t// ErrNoData indicates no time-series data exists for the requested metric/level.\n   145→\tErrNoData error = errors.New(\"[METRICSTORE]> no data for this metric/level\")\n   146→\n   147→\t// ErrDataDoesNotAlign indicates that aggregated data from child scopes\n   148→\t// does not align with the parent scope's expected timestamps/intervals.\n   149→\tErrDataDoesNotAlign error = errors.New(\"[METRICSTORE]> data from lower granularities does not align\")\n   150→)\n   151→\n   152→// buffer stores time-series data for a single metric at a specific hierarchical level.\n   153→//\n   154→// Buffers form doubly-linked chains ordered by time. When capacity is reached,\n   155→// a new buffer becomes the head and the old head is linked via prev/next.\n   156→//\n   157→// Fields:\n   158→//   - prev:      Link to older buffer in the chain (nil if this is oldest)\n   159→//   - next:      Link to newer buffer in the chain (nil if this is newest/head)\n   160→//   - data:      Time-series values (schema.Float supports NaN for missing data)\n   161→//   - frequency: Measurement interval in seconds\n   162→//   - start:     Start timestamp (adjusted by -frequency/2 for alignment)\n   163→//   - archived:  True if data has been persisted to disk archive\n   164→//   - closed:    True if buffer is no longer accepting writes\n   165→//\n   166→// Index calculation: index = (timestamp - start) / frequency\n   167→// Actual data timestamp: start + (frequency / 2) + (index * frequency)\n   168→type buffer struct {\n   169→\tprev      *buffer\n   170→\tnext      *buffer\n   171→\tdata      []schema.Float\n   172→\tfrequency int64\n   173→\tstart     int64\n   174→\tarchived  bool\n   175→\tclosed    bool\n   176→\tlastUsed  int64\n   177→}\n   178→\n   179→func newBuffer(ts, freq int64) *buffer {\n   180→\tb := bufferPool.Get()\n   181→\tb.frequency = freq\n   182→\tb.start = ts - (freq / 2)\n   183→\tb.prev = nil\n   184→\tb.next = nil\n   185→\tb.archived = false\n   186→\tb.closed = false\n   187→\tb.data = b.data[:0]\n   188→\treturn b\n   189→}\n   190→\n   191→// write appends a timestamped value to the buffer chain.\n   192→//\n   193→// Returns the head buffer (which may be newly created if capacity was reached).\n   194→// Timestamps older than the buffer's start are rejected. If the calculated index\n   195→// exceeds capacity, a new buffer is allocated and linked as the new head.\n   196→//\n   197→// Missing timestamps are automatically filled with NaN values to maintain alignment.\n   198→// Overwrites are allowed if the index is already within the existing data slice.\n   199→//\n   200→// Parameters:\n   201→//   - ts:    Unix timestamp in seconds\n   202→//   - value: Metric value (can be schema.NaN for missing data)\n   203→//\n   204→// Returns:\n   205→//   - *buffer: The new head buffer (same as b if no new buffer created)\n   206→//   - error:   Non-nil if timestamp is before buffer start\n   207→func (b *buffer) write(ts int64, value schema.Float) (*buffer, error) {\n   208→\tif ts < b.start {\n   209→\t\treturn nil, errors.New(\"[METRICSTORE]> cannot write value to buffer from past\")\n   210→\t}\n   211→\n   212→\t// idx := int((ts - b.start + (b.frequency / 3)) / b.frequency)\n   213→\tidx := int((ts - b.start) / b.frequency)\n   214→\tif idx >= cap(b.data) {\n   215→\t\tnewbuf := newBuffer(ts, b.frequency)\n   216→\t\tnewbuf.prev = b\n   217→\t\tb.next = newbuf\n   218→\t\tb = newbuf\n   219→\t\tidx = 0\n   220→\t}\n   221→\n   222→\t// Overwriting value or writing value from past\n   223→\tif idx < len(b.data) {\n   224→\t\tb.data[idx] = value\n   225→\t\treturn b, nil\n   226→\t}\n   227→\n   228→\t// Fill up unwritten slots with NaN\n   229→\tfor i := len(b.data); i < idx; i++ {\n   230→\t\tb.data = append(b.data, schema.NaN)\n   231→\t}\n   232→\n   233→\tb.data = append(b.data, value)\n   234→\treturn b, nil\n   235→}\n   236→\n   237→func (b *buffer) end() int64 {\n   238→\treturn b.firstWrite() + int64(len(b.data))*b.frequency\n   239→}\n   240→\n   241→func (b *buffer) firstWrite() int64 {\n   242→\treturn b.start + (b.frequency / 2)\n   243→}\n   244→\n   245→// read retrieves time-series data from the buffer chain for the specified time range.\n   246→//\n   247→// Traverses the buffer chain backwards (via prev links) if 'from' precedes the current\n   248→// buffer's start. Missing data points are represented as NaN. Values are accumulated\n   249→// into the provided 'data' slice (using +=, so caller must zero-initialize if needed).\n   250→//\n   251→// The function adjusts the actual time range returned if data is unavailable at the\n   252→// boundaries (returned via adjusted from/to timestamps).\n   253→//\n   254→// Parameters:\n   255→//   - from: Start timestamp (Unix seconds)\n   256→//   - to:   End timestamp (Unix seconds, exclusive)\n   257→//   - data: Pre-allocated slice to accumulate results (must be large enough)\n   258→//\n   259→// Returns:\n   260→//   - []schema.Float: Slice of data (may be shorter than input 'data' slice)\n   261→//   - int64:          Actual start timestamp with available data\n   262→//   - int64:          Actual end timestamp (exclusive)\n   263→//   - error:          Non-nil on failure\n   264→//\n   265→// Panics if 'data' slice is too small to hold all values in [from, to).\n   266→func (b *buffer) read(from, to int64, data []schema.Float) ([]schema.Float, int64, int64, error) {\n   267→\t// Walk back to the buffer that covers 'from', adjusting if we hit the oldest.\n   268→\tfor from < b.firstWrite() {\n   269→\t\tif b.prev == nil {\n   270→\t\t\tfrom = b.firstWrite()\n   271→\t\t\tbreak\n   272→\t\t}\n   273→\t\tb = b.prev\n   274→\t}\n   275→\n   276→\ti := 0\n   277→\tt := from\n   278→\tfor ; t < to; t += b.frequency {\n   279→\t\tidx := int((t - b.start) / b.frequency)\n   280→\t\tif idx >= cap(b.data) {\n   281→\t\t\tif b.next == nil {\n   282→\t\t\t\tbreak\n   283→\t\t\t}\n   284→\t\t\tb = b.next\n   285→\t\t\t// Recalculate idx in the new buffer; a gap between buffers may exist.\n   286→\t\t\tidx = int((t - b.start) / b.frequency)\n   287→\t\t}\n   288→\n   289→\t\tif idx >= len(b.data) {\n   290→\t\t\tif b.next == nil || to <= b.next.start {\n   291→\t\t\t\tbreak\n   292→\t\t\t}\n   293→\t\t\tdata[i] += schema.NaN // NaN + anything = NaN; propagates missing data\n   294→\t\t} else if t < b.start {\n   295→\t\t\tdata[i] += schema.NaN // gap before this buffer's first write\n   296→\t\t} else {\n   297→\t\t\tdata[i] += b.data[idx]\n   298→\t\t}\n   299→\t\ti++\n   300→\t}\n   301→\n   302→\treturn data[:i], from, t, nil\n   303→}\n   304→\n   305→// free removes buffers older than the specified timestamp from the chain.\n   306→//\n   307→// Recursively traverses backwards (via prev) and unlinks buffers whose end time\n   308→// is before the retention threshold. Freed buffers are returned to the pool if\n   309→// they have the standard capacity (BufferCap).\n   310→//\n   311→// Parameters:\n   312→//   - t: Retention threshold timestamp (Unix seconds)\n   313→//\n   314→// Returns:\n   315→//   - delme: True if the current buffer itself should be deleted by caller\n   316→//   - n:     Number of buffers freed in this subtree\n   317→func (b *buffer) free(t int64) (delme bool, n int) {\n   318→\tif b.prev != nil {\n   319→\t\tdelme, m := b.prev.free(t)\n   320→\t\tn += m\n   321→\t\tif delme {\n   322→\t\t\tb.prev.next = nil\n   323→\t\t\tif cap(b.prev.data) != BufferCap {\n   324→\t\t\t\tb.prev.data = make([]schema.Float, 0, BufferCap)\n   325→\t\t\t}\n   326→\t\t\tb.prev.lastUsed = time.Now().Unix()\n   327→\t\t\tbufferPool.Put(b.prev)\n   328→\t\t\tb.prev = nil\n   329→\t\t}\n   330→\t}\n   331→\n   332→\tend := b.end()\n   333→\tif end < t {\n   334→\t\treturn true, n + 1\n   335→\t}\n   336→\n   337→\treturn false, n\n   338→}\n   339→\n   340→// forceFreeOldest recursively finds the end of the linked list (the oldest buffer)\n   341→// and removes it.\n   342→// Returns:\n   343→//\n   344→//\tdelme: true if 'b' itself is the oldest and should be removed by the caller\n   345→//\tn:     the number of buffers freed (will be 1 or 0)\n   346→func (b *buffer) forceFreeOldest() (delme bool, n int) {\n   347→\t// If there is a previous buffer, recurse down to find the oldest\n   348→\tif b.prev != nil {\n   349→\t\tdelPrev, freed := b.prev.forceFreeOldest()\n   350→\n   351→\t\t// If the previous buffer signals it should be deleted:\n   352→\t\tif delPrev {\n   353→\t\t\tb.prev.next = nil\n   354→\t\t\tif cap(b.prev.data) != BufferCap {\n   355→\t\t\t\tb.prev.data = make([]schema.Float, 0, BufferCap)\n   356→\t\t\t}\n   357→\t\t\tb.prev.lastUsed = time.Now().Unix()\n   358→\t\t\tbufferPool.Put(b.prev)\n   359→\t\t\tb.prev = nil\n   360→\t\t}\n   361→\t\treturn false, freed\n   362→\t}\n   363→\n   364→\t// If b.prev is nil, THIS buffer is the oldest.\n   365→\t// We return true so the parent (or the Level loop) knows to delete reference to 'b'.\n   366→\treturn true, 1\n   367→}\n   368→\n   369→// iterFromTo invokes callback on every buffer in the chain that overlaps [from, to].\n   370→//\n   371→// Traverses backwards (via prev) first, then processes current buffer if it overlaps\n   372→// the time range. Used for checkpoint/archive operations that need to serialize buffers\n   373→// within a specific time window.\n   374→//\n   375→// Parameters:\n   376→//   - from:     Start timestamp (Unix seconds, inclusive)\n   377→//   - to:       End timestamp (Unix seconds, inclusive)\n   378→//   - callback: Function to invoke on each overlapping buffer\n   379→//\n   380→// Returns:\n   381→//   - error: First error returned by callback, or nil if all succeeded\n   382→func (b *buffer) iterFromTo(from, to int64, callback func(b *buffer) error) error {\n   383→\tif b == nil {\n   384→\t\treturn nil\n   385→\t}\n   386→\n   387→\t// Collect overlapping buffers walking backwards (newest → oldest).\n   388→\tvar matching []*buffer\n   389→\tfor cur := b; cur != nil; cur = cur.prev {\n   390→\t\tif from <= cur.end() && cur.start <= to {\n   391→\t\t\tmatching = append(matching, cur)\n   392→\t\t}\n   393→\t}\n   394→\n   395→\t// Invoke callback in chronological order (oldest → newest).\n   396→\tfor i := len(matching) - 1; i >= 0; i-- {\n   397→\t\tif err := callback(matching[i]); err != nil {\n   398→\t\t\treturn err\n   399→\t\t}\n   400→\t}\n   401→\treturn nil\n   402→}\n   403→\n   404→func (b *buffer) count() int64 {\n   405→\tvar res int64\n   406→\tfor ; b != nil; b = b.prev {\n   407→\t\tres += int64(len(b.data))\n   408→\t}\n   409→\treturn res\n   410→}\n   411→"}]},"uuid":"18dc95ba-de37-443a-a757-088fe0bc79b2","timestamp":"2026-03-13T06:51:39.743Z","toolUseResult":{"type":"text","file":{"filePath":"/Users/jan/prg/ClusterCockpit/cc-backend/pkg/metricstore/buffer.go","content":"// Copyright (C) NHR@FAU, University Erlangen-Nuremberg.\n// All rights reserved. This file is part of cc-backend.\n// Use of this source code is governed by a MIT-style\n// license that can be found in the LICENSE file.\n\n// Package metricstore provides buffer.go: Time-series data buffer implementation.\n//\n// # Buffer Architecture\n//\n// Each metric at each hierarchical level (cluster/host/cpu/etc.) uses a linked-list\n// chain of fixed-size buffers to store time-series data. This design:\n//\n//   - Avoids reallocation/copying when growing (new links added instead)\n//   - Enables efficient pooling (buffers returned to sync.Pool)\n//   - Supports traversal back in time (via prev pointers)\n//   - Maintains temporal ordering (newer data in later buffers)\n//\n// # Buffer Chain Example\n//\n//\t[oldest buffer] <- prev -- [older] <- prev -- [newest buffer (head)]\n//\t  start=1000               start=1512           start=2024\n//\t  data=[v0...v511]         data=[v0...v511]     data=[v0...v42]\n//\n// When the head buffer reaches capacity (BufferCap = 512), a new buffer becomes\n// the new head and the old head is linked via prev.\n//\n// # Pooling Strategy\n//\n// sync.Pool reduces GC pressure for the common case (BufferCap-sized allocations).\n// Non-standard capacity buffers are not pooled (e.g., from checkpoint deserialization).\n//\n// # Time Alignment\n//\n// Timestamps are aligned to measurement frequency intervals:\n//\n//\tindex = (timestamp - buffer.start) / buffer.frequency\n//\tactualTime = buffer.start + (frequency / 2) + (index * frequency)\n//\n// Missing data points are represented as NaN values. The read() function performs\n// linear interpolation where possible.\npackage metricstore\n\nimport (\n\t\"errors\"\n\t\"sync\"\n\t\"time\"\n\n\t\"github.com/ClusterCockpit/cc-lib/v2/schema\"\n)\n\n// BufferCap is the default buffer capacity.\n// buffer.data will only ever grow up to its capacity and a new link\n// in the buffer chain will be created if needed so that no copying\n// of data or reallocation needs to happen on writes.\nconst BufferCap int = DefaultBufferCapacity\n\n// BufferPool is the global instance.\n// It is initialized immediately when the package loads.\nvar bufferPool = NewPersistentBufferPool()\n\ntype PersistentBufferPool struct {\n\tpool []*buffer\n\tmu   sync.Mutex\n}\n\n// NewPersistentBufferPool creates a dynamic pool for buffers.\nfunc NewPersistentBufferPool() *PersistentBufferPool {\n\treturn &PersistentBufferPool{\n\t\tpool: make([]*buffer, 0),\n\t}\n}\n\nfunc (p *PersistentBufferPool) Get() *buffer {\n\tp.mu.Lock()\n\tdefer p.mu.Unlock()\n\n\tn := len(p.pool)\n\tif n == 0 {\n\t\t// Pool is empty, allocate a new one\n\t\treturn &buffer{\n\t\t\tdata: make([]schema.Float, 0, BufferCap),\n\t\t}\n\t}\n\n\t// Reuse existing buffer from the pool\n\tb := p.pool[n-1]\n\tp.pool[n-1] = nil // Avoid memory leak\n\tp.pool = p.pool[:n-1]\n\treturn b\n}\n\n// Put returns b to the pool. The caller must set b.lastUsed = time.Now().Unix()\n// before calling Put so that Clean() can evict idle entries correctly.\nfunc (p *PersistentBufferPool) Put(b *buffer) {\n\t// Reset the buffer before putting it back\n\tb.data = b.data[:0]\n\n\tp.mu.Lock()\n\tdefer p.mu.Unlock()\n\n\tp.pool = append(p.pool, b)\n}\n\n// GetSize returns the exact number of buffers currently sitting in the pool.\nfunc (p *PersistentBufferPool) GetSize() int {\n\tp.mu.Lock()\n\tdefer p.mu.Unlock()\n\treturn len(p.pool)\n}\n\n// Clear drains all buffers currently in the pool, allowing the GC to collect them.\nfunc (p *PersistentBufferPool) Clear() {\n\tp.mu.Lock()\n\tdefer p.mu.Unlock()\n\tfor i := range p.pool {\n\t\tp.pool[i] = nil\n\t}\n\tp.pool = p.pool[:0]\n}\n\n// Clean removes buffers from the pool that haven't been used in the given duration.\n// It uses a simple LRU approach based on the lastUsed timestamp.\nfunc (p *PersistentBufferPool) Clean(threshold int64) {\n\tp.mu.Lock()\n\tdefer p.mu.Unlock()\n\n\t// Filter in place, retaining only buffers returned to the pool recently enough.\n\tactive := p.pool[:0]\n\tfor _, b := range p.pool {\n\t\tif b.lastUsed >= threshold {\n\t\t\tactive = append(active, b)\n\t\t}\n\t}\n\n\t// Nullify the rest to prevent memory leaks\n\tfor i := len(active); i < len(p.pool); i++ {\n\t\tp.pool[i] = nil\n\t}\n\n\tp.pool = active\n}\n\nvar (\n\t// ErrNoData indicates no time-series data exists for the requested metric/level.\n\tErrNoData error = errors.New(\"[METRICSTORE]> no data for this metric/level\")\n\n\t// ErrDataDoesNotAlign indicates that aggregated data from child scopes\n\t// does not align with the parent scope's expected timestamps/intervals.\n\tErrDataDoesNotAlign error = errors.New(\"[METRICSTORE]> data from lower granularities does not align\")\n)\n\n// buffer stores time-series data for a single metric at a specific hierarchical level.\n//\n// Buffers form doubly-linked chains ordered by time. When capacity is reached,\n// a new buffer becomes the head and the old head is linked via prev/next.\n//\n// Fields:\n//   - prev:      Link to older buffer in the chain (nil if this is oldest)\n//   - next:      Link to newer buffer in the chain (nil if this is newest/head)\n//   - data:      Time-series values (schema.Float supports NaN for missing data)\n//   - frequency: Measurement interval in seconds\n//   - start:     Start timestamp (adjusted by -frequency/2 for alignment)\n//   - archived:  True if data has been persisted to disk archive\n//   - closed:    True if buffer is no longer accepting writes\n//\n// Index calculation: index = (timestamp - start) / frequency\n// Actual data timestamp: start + (frequency / 2) + (index * frequency)\ntype buffer struct {\n\tprev      *buffer\n\tnext      *buffer\n\tdata      []schema.Float\n\tfrequency int64\n\tstart     int64\n\tarchived  bool\n\tclosed    bool\n\tlastUsed  int64\n}\n\nfunc newBuffer(ts, freq int64) *buffer {\n\tb := bufferPool.Get()\n\tb.frequency = freq\n\tb.start = ts - (freq / 2)\n\tb.prev = nil\n\tb.next = nil\n\tb.archived = false\n\tb.closed = false\n\tb.data = b.data[:0]\n\treturn b\n}\n\n// write appends a timestamped value to the buffer chain.\n//\n// Returns the head buffer (which may be newly created if capacity was reached).\n// Timestamps older than the buffer's start are rejected. If the calculated index\n// exceeds capacity, a new buffer is allocated and linked as the new head.\n//\n// Missing timestamps are automatically filled with NaN values to maintain alignment.\n// Overwrites are allowed if the index is already within the existing data slice.\n//\n// Parameters:\n//   - ts:    Unix timestamp in seconds\n//   - value: Metric value (can be schema.NaN for missing data)\n//\n// Returns:\n//   - *buffer: The new head buffer (same as b if no new buffer created)\n//   - error:   Non-nil if timestamp is before buffer start\nfunc (b *buffer) write(ts int64, value schema.Float) (*buffer, error) {\n\tif ts < b.start {\n\t\treturn nil, errors.New(\"[METRICSTORE]> cannot write value to buffer from past\")\n\t}\n\n\t// idx := int((ts - b.start + (b.frequency / 3)) / b.frequency)\n\tidx := int((ts - b.start) / b.frequency)\n\tif idx >= cap(b.data) {\n\t\tnewbuf := newBuffer(ts, b.frequency)\n\t\tnewbuf.prev = b\n\t\tb.next = newbuf\n\t\tb = newbuf\n\t\tidx = 0\n\t}\n\n\t// Overwriting value or writing value from past\n\tif idx < len(b.data) {\n\t\tb.data[idx] = value\n\t\treturn b, nil\n\t}\n\n\t// Fill up unwritten slots with NaN\n\tfor i := len(b.data); i < idx; i++ {\n\t\tb.data = append(b.data, schema.NaN)\n\t}\n\n\tb.data = append(b.data, value)\n\treturn b, nil\n}\n\nfunc (b *buffer) end() int64 {\n\treturn b.firstWrite() + int64(len(b.data))*b.frequency\n}\n\nfunc (b *buffer) firstWrite() int64 {\n\treturn b.start + (b.frequency / 2)\n}\n\n// read retrieves time-series data from the buffer chain for the specified time range.\n//\n// Traverses the buffer chain backwards (via prev links) if 'from' precedes the current\n// buffer's start. Missing data points are represented as NaN. Values are accumulated\n// into the provided 'data' slice (using +=, so caller must zero-initialize if needed).\n//\n// The function adjusts the actual time range returned if data is unavailable at the\n// boundaries (returned via adjusted from/to timestamps).\n//\n// Parameters:\n//   - from: Start timestamp (Unix seconds)\n//   - to:   End timestamp (Unix seconds, exclusive)\n//   - data: Pre-allocated slice to accumulate results (must be large enough)\n//\n// Returns:\n//   - []schema.Float: Slice of data (may be shorter than input 'data' slice)\n//   - int64:          Actual start timestamp with available data\n//   - int64:          Actual end timestamp (exclusive)\n//   - error:          Non-nil on failure\n//\n// Panics if 'data' slice is too small to hold all values in [from, to).\nfunc (b *buffer) read(from, to int64, data []schema.Float) ([]schema.Float, int64, int64, error) {\n\t// Walk back to the buffer that covers 'from', adjusting if we hit the oldest.\n\tfor from < b.firstWrite() {\n\t\tif b.prev == nil {\n\t\t\tfrom = b.firstWrite()\n\t\t\tbreak\n\t\t}\n\t\tb = b.prev\n\t}\n\n\ti := 0\n\tt := from\n\tfor ; t < to; t += b.frequency {\n\t\tidx := int((t - b.start) / b.frequency)\n\t\tif idx >= cap(b.data) {\n\t\t\tif b.next == nil {\n\t\t\t\tbreak\n\t\t\t}\n\t\t\tb = b.next\n\t\t\t// Recalculate idx in the new buffer; a gap between buffers may exist.\n\t\t\tidx = int((t - b.start) / b.frequency)\n\t\t}\n\n\t\tif idx >= len(b.data) {\n\t\t\tif b.next == nil || to <= b.next.start {\n\t\t\t\tbreak\n\t\t\t}\n\t\t\tdata[i] += schema.NaN // NaN + anything = NaN; propagates missing data\n\t\t} else if t < b.start {\n\t\t\tdata[i] += schema.NaN // gap before this buffer's first write\n\t\t} else {\n\t\t\tdata[i] += b.data[idx]\n\t\t}\n\t\ti++\n\t}\n\n\treturn data[:i], from, t, nil\n}\n\n// free removes buffers older than the specified timestamp from the chain.\n//\n// Recursively traverses backwards (via prev) and unlinks buffers whose end time\n// is before the retention threshold. Freed buffers are returned to the pool if\n// they have the standard capacity (BufferCap).\n//\n// Parameters:\n//   - t: Retention threshold timestamp (Unix seconds)\n//\n// Returns:\n//   - delme: True if the current buffer itself should be deleted by caller\n//   - n:     Number of buffers freed in this subtree\nfunc (b *buffer) free(t int64) (delme bool, n int) {\n\tif b.prev != nil {\n\t\tdelme, m := b.prev.free(t)\n\t\tn += m\n\t\tif delme {\n\t\t\tb.prev.next = nil\n\t\t\tif cap(b.prev.data) != BufferCap {\n\t\t\t\tb.prev.data = make([]schema.Float, 0, BufferCap)\n\t\t\t}\n\t\t\tb.prev.lastUsed = time.Now().Unix()\n\t\t\tbufferPool.Put(b.prev)\n\t\t\tb.prev = nil\n\t\t}\n\t}\n\n\tend := b.end()\n\tif end < t {\n\t\treturn true, n + 1\n\t}\n\n\treturn false, n\n}\n\n// forceFreeOldest recursively finds the end of the linked list (the oldest buffer)\n// and removes it.\n// Returns:\n//\n//\tdelme: true if 'b' itself is the oldest and should be removed by the caller\n//\tn:     the number of buffers freed (will be 1 or 0)\nfunc (b *buffer) forceFreeOldest() (delme bool, n int) {\n\t// If there is a previous buffer, recurse down to find the oldest\n\tif b.prev != nil {\n\t\tdelPrev, freed := b.prev.forceFreeOldest()\n\n\t\t// If the previous buffer signals it should be deleted:\n\t\tif delPrev {\n\t\t\tb.prev.next = nil\n\t\t\tif cap(b.prev.data) != BufferCap {\n\t\t\t\tb.prev.data = make([]schema.Float, 0, BufferCap)\n\t\t\t}\n\t\t\tb.prev.lastUsed = time.Now().Unix()\n\t\t\tbufferPool.Put(b.prev)\n\t\t\tb.prev = nil\n\t\t}\n\t\treturn false, freed\n\t}\n\n\t// If b.prev is nil, THIS buffer is the oldest.\n\t// We return true so the parent (or the Level loop) knows to delete reference to 'b'.\n\treturn true, 1\n}\n\n// iterFromTo invokes callback on every buffer in the chain that overlaps [from, to].\n//\n// Traverses backwards (via prev) first, then processes current buffer if it overlaps\n// the time range. Used for checkpoint/archive operations that need to serialize buffers\n// within a specific time window.\n//\n// Parameters:\n//   - from:     Start timestamp (Unix seconds, inclusive)\n//   - to:       End timestamp (Unix seconds, inclusive)\n//   - callback: Function to invoke on each overlapping buffer\n//\n// Returns:\n//   - error: First error returned by callback, or nil if all succeeded\nfunc (b *buffer) iterFromTo(from, to int64, callback func(b *buffer) error) error {\n\tif b == nil {\n\t\treturn nil\n\t}\n\n\t// Collect overlapping buffers walking backwards (newest → oldest).\n\tvar matching []*buffer\n\tfor cur := b; cur != nil; cur = cur.prev {\n\t\tif from <= cur.end() && cur.start <= to {\n\t\t\tmatching = append(matching, cur)\n\t\t}\n\t}\n\n\t// Invoke callback in chronological order (oldest → newest).\n\tfor i := len(matching) - 1; i >= 0; i-- {\n\t\tif err := callback(matching[i]); err != nil {\n\t\t\treturn err\n\t\t}\n\t}\n\treturn nil\n}\n\nfunc (b *buffer) count() int64 {\n\tvar res int64\n\tfor ; b != nil; b = b.prev {\n\t\tres += int64(len(b.data))\n\t}\n\treturn res\n}\n","numLines":411,"startLine":1,"totalLines":411}},"sourceToolAssistantUUID":"46ca9b63-5718-455b-abef-764e1ad29322","userType":"external","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"39705f8c-1691-4d60-b0aa-39f588ed9dcf","version":"2.1.74","gitBranch":"hotfix","slug":"linear-roaming-glade"}
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This file is part of cc-backend.\n// Use of this source code is governed by a MIT-style\n// license that can be found in the LICENSE file.\n\n// Package metricstore provides config.go: Configuration structures and metric management.\n//\n// # Configuration Hierarchy\n//\n// The metricstore package uses nested configuration structures:\n//\n//\tMetricStoreConfig (Keys)\n//\t├─ NumWorkers: Parallel checkpoint/archive workers\n//\t├─ RetentionInMemory: How long to keep data in RAM (also used as cleanup interval)\n//\t├─ MemoryCap: Memory limit in bytes (triggers forceFree)\n//\t├─ Checkpoints: Persistence configuration\n//\t│  ├─ FileFormat: \"json\" or \"wal\" (default: \"wal\")\n//\t│  └─ RootDir: Checkpoint storage path\n//\t├─ Cleanup: Long-term storage configuration (interval = RetentionInMemory)\n//\t│  ├─ RootDir: Archive storage path (archive mode only)\n//\t│  └─ Mode: \"delete\" or \"archive\"\n//\t├─ Debug: Development/debugging options\n//\t└─ Subscriptions: NATS topic subscriptions for metric ingestion\n//\n// # Metric Configuration\n//\n// Each metric (e.g., \"cpu_load\", \"mem_used\") has a MetricConfig entry in the global\n// Metrics map, defining:\n//\n//   - Frequency: Measurement interval in seconds\n//   - Aggregation: How to combine values (sum/avg/none) when transforming scopes\n//   - offset: Internal index into Level.metrics slice (assigned during Init)\n//\n// # AggregationStrategy\n//\n// Determines how to combine metric values when aggregating from finer to coarser scopes:\n//\n//   - NoAggregation: Do not combine (incompatible scopes)\n//   - SumAggregation: Add values (e.g., power consumption: core→socket)\n//   - AvgAggregation: Average values (e.g., temperature: core→socket)\npackage metricstore\n\nimport (\n\t\"fmt\"\n\t\"time\"\n\n\t\"github.com/ClusterCockpit/cc-backend/pkg/archive\"\n\tcclog \"github.com/ClusterCockpit/cc-lib/v2/ccLogger\"\n\t\"github.com/ClusterCockpit/cc-lib/v2/schema\"\n)\n\nconst (\n\tDefaultMaxWorkers                 = 10\n\tDefaultBufferCapacity             = 512\n\tDefaultGCTriggerInterval          = 100\n\tDefaultMemoryUsageTrackerInterval = 1 * time.Hour\n)\n\n// Checkpoints configures periodic persistence of in-memory metric data.\n//\n// Fields:\n//   - FileFormat: \"json\" (human-readable, periodic) or \"wal\" (binary snapshot + WAL, crash-safe); default is \"wal\"\n//   - RootDir:    Filesystem path for checkpoint files (created if missing)\ntype Checkpoints struct {\n\tFileFormat string `json:\"file-format\"`\n\tRootDir    string `json:\"directory\"`\n}\n\n// Debug provides development and profiling options.\n//\n// Fields:\n//   - DumpToFile: Path to dump checkpoint data for inspection (empty = disabled)\n//   - EnableGops: Enable gops agent for live runtime debugging (https://github.com/google/gops)\ntype Debug struct {\n\tDumpToFile string `json:\"dump-to-file\"`\n\tEnableGops bool   `json:\"gops\"`\n}\n\n// Cleanup configures long-term storage of old metric data.\n//\n// Data older than RetentionInMemory is archived to disk or deleted.\n// The cleanup interval is always RetentionInMemory.\n//\n// Fields:\n//   - RootDir: Filesystem path for archived data (used in \"archive\" mode)\n//   - Mode:    \"delete\" (discard old data) or \"archive\" (write to RootDir)\ntype Cleanup struct {\n\tRootDir string `json:\"directory\"`\n\tMode    string `json:\"mode\"`\n}\n\n// Subscriptions defines NATS topics to subscribe to for metric ingestion.\n//\n// Each subscription receives metrics via NATS messaging, enabling real-time\n// data collection from compute nodes.\n//\n// Fields:\n//   - SubscribeTo: NATS subject/channel name (e.g., \"metrics.compute.*\")\n//   - ClusterTag:  Default cluster name for metrics without cluster tag (optional)\ntype Subscriptions []struct {\n\t// Channel name\n\tSubscribeTo string `json:\"subscribe-to\"`\n\n\t// Allow lines without a cluster tag, use this as default, optional\n\tClusterTag string `json:\"cluster-tag\"`\n}\n\n// MetricStoreConfig defines the main configuration for the metricstore.\n//\n// Loaded from cc-backend's config.json \"metricstore\" section. Controls memory usage,\n// persistence, archiving, and metric ingestion.\n//\n// Fields:\n//   - NumWorkers:        Parallel workers for checkpoint/archive (0 = auto: min(NumCPU/2+1, 10))\n//   - RetentionInMemory: Duration string (e.g., \"48h\") for in-memory data retention\n//   - MemoryCap:         Max bytes for buffer data (0 = unlimited); triggers forceFree when exceeded\n//   - Checkpoints:       Periodic persistence configuration\n//   - Debug:             Development/profiling options (nil = disabled)\n//   - Archive:           Long-term storage configuration (nil = disabled)\n//   - Subscriptions:     NATS topics for metric ingestion (nil = polling only)\ntype MetricStoreConfig struct {\n\t// Number of concurrent workers for checkpoint and archive operations.\n\t// If not set or 0, defaults to min(runtime.NumCPU()/2+1, 10)\n\tNumWorkers        int            `json:\"num-workers\"`\n\tRetentionInMemory string         `json:\"retention-in-memory\"`\n\tMemoryCap         int            `json:\"memory-cap\"`\n\tCheckpoints       Checkpoints    `json:\"checkpoints\"`\n\tDebug             *Debug         `json:\"debug\"`\n\tCleanup           *Cleanup       `json:\"cleanup\"`\n\tSubscriptions     *Subscriptions `json:\"nats-subscriptions\"`\n}\n\n// Keys is the global metricstore configuration instance.\n//\n// Initialized with defaults, then overwritten by cc-backend's config.json.\n// Accessed by Init(), Checkpointing(), and other lifecycle functions.\nvar Keys MetricStoreConfig = MetricStoreConfig{\n\tCheckpoints: Checkpoints{\n\t\tFileFormat: \"wal\",\n\t\tRootDir:    \"./var/checkpoints\",\n\t},\n\tCleanup: &Cleanup{\n\t\tMode: \"delete\",\n\t},\n}\n\n// AggregationStrategy defines how to combine metric values across hierarchy levels.\n//\n// Used when transforming data from finer-grained scopes (e.g., core) to coarser scopes\n// (e.g., socket). This is SPATIAL aggregation, not TEMPORAL (time-based) aggregation.\n//\n// Values:\n//   - NoAggregation:  Do not aggregate (incompatible scopes or non-aggregatable metrics)\n//   - SumAggregation: Add values (e.g., power: sum core power → socket power)\n//   - AvgAggregation: Average values (e.g., temperature: average core temps → socket temp)\ntype AggregationStrategy int\n\nconst (\n\tNoAggregation  AggregationStrategy = iota // Do not aggregate\n\tSumAggregation                            // Sum values (e.g., power, energy)\n\tAvgAggregation                            // Average values (e.g., temperature, utilization)\n)\n\n// AssignAggregationStrategy parses a string into an AggregationStrategy value.\n//\n// Used when loading metric configurations from JSON/YAML files.\n//\n// Parameters:\n//   - str: \"sum\", \"avg\", or \"\" (empty string for NoAggregation)\n//\n// Returns:\n//   - AggregationStrategy: Parsed value\n//   - error:               Non-nil if str is unrecognized\nfunc AssignAggregationStrategy(str string) (AggregationStrategy, error) {\n\tswitch str {\n\tcase \"\":\n\t\treturn NoAggregation, nil\n\tcase \"sum\":\n\t\treturn SumAggregation, nil\n\tcase \"avg\":\n\t\treturn AvgAggregation, nil\n\tdefault:\n\t\treturn NoAggregation, fmt.Errorf(\"[METRICSTORE]> unknown aggregation strategy: %s\", str)\n\t}\n}\n\n// MetricConfig defines configuration for a single metric type.\n//\n// Stored in the global Metrics map, keyed by metric name (e.g., \"cpu_load\").\n//\n// Fields:\n//   - Frequency:   Measurement interval in seconds (e.g., 60 for 1-minute granularity)\n//   - Aggregation: How to combine values across hierarchy levels (sum/avg/none)\n//   - offset:      Internal index into Level.metrics slice (assigned during Init)\ntype MetricConfig struct {\n\t// Interval in seconds at which measurements are stored\n\tFrequency int64\n\n\t// Can be 'sum', 'avg' or null. Describes how to aggregate metrics from the same timestep over the hierarchy.\n\tAggregation AggregationStrategy\n\n\t// Private, used internally...\n\toffset int\n}\n\nfunc BuildMetricList() map[string]MetricConfig {\n\tvar metrics map[string]MetricConfig = make(map[string]MetricConfig)\n\n\taddMetric := func(name string, metric MetricConfig) error {\n\t\tif metrics == nil {\n\t\t\tmetrics = make(map[string]MetricConfig, 0)\n\t\t}\n\n\t\tif existingMetric, ok := metrics[name]; ok {\n\t\t\tif existingMetric.Frequency != metric.Frequency {\n\t\t\t\tif existingMetric.Frequency < metric.Frequency {\n\t\t\t\t\texistingMetric.Frequency = metric.Frequency\n\t\t\t\t\tmetrics[name] = existingMetric\n\t\t\t\t}\n\t\t\t}\n\t\t} else {\n\t\t\tmetrics[name] = metric\n\t\t}\n\n\t\treturn nil\n\t}\n\n\t// Helper function to add metric configuration\n\taddMetricConfig := func(mc *schema.MetricConfig) {\n\t\tagg, err := AssignAggregationStrategy(mc.Aggregation)\n\t\tif err != nil {\n\t\t\tcclog.Warnf(\"Could not find aggregation strategy for metric config '%s': %s\", mc.Name, err.Error())\n\t\t}\n\n\t\taddMetric(mc.Name, MetricConfig{\n\t\t\tFrequency:   int64(mc.Timestep),\n\t\t\tAggregation: agg,\n\t\t})\n\t}\n\tfor _, c := range archive.Clusters {\n\t\tfor _, mc := range c.MetricConfig {\n\t\t\taddMetricConfig(mc)\n\t\t}\n\n\t\tfor _, sc := range c.SubClusters {\n\t\t\tfor _, mc := range sc.MetricConfig {\n\t\t\t\taddMetricConfig(mc)\n\t\t\t}\n\t\t}\n\t}\n\n\treturn metrics\n}\n","structuredPatch":[{"oldStart":53,"oldLines":7,"newStart":53,"newLines":7,"lines":["   DefaultMaxWorkers                 = 10","   DefaultBufferCapacity             = 512","   DefaultGCTriggerInterval          = 100","-  DefaultMemoryUsageTrackerInterval = 1 * time.Hour","+  DefaultMemoryUsageTrackerInterval = 5 * time.Minute"," )"," "," // Checkpoints configures periodic persistence of in-memory metric data."]}],"userModified":false,"replaceAll":false},"sourceToolAssistantUUID":"0998dbf5-feda-4d6e-89d1-49a9d9718560","userType":"external","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"39705f8c-1691-4d60-b0aa-39f588ed9dcf","version":"2.1.74","gitBranch":"hotfix","slug":"linear-roaming-glade"}
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This file is part of cc-backend.\n// Use of this source code is governed by a MIT-style\n// license that can be found in the LICENSE file.\n\n// This file implements ingestion of InfluxDB line-protocol metric data received\n// over NATS. Each line encodes one metric sample with the following structure:\n//\n//\t<measurement>[,cluster=<c>][,hostname=<h>][,type=<t>][,type-id=<id>][,subtype=<s>][,stype-id=<id>] value=<v> [<timestamp>]\n//\n// The measurement name identifies the metric (e.g. \"cpu_load\"). Tags provide\n// routing information (cluster, host) and optional sub-device selectors (type,\n// subtype). Only one field is expected per line: \"value\".\n//\n// After decoding, each sample is:\n//  1. Written to the in-memory store via ms.WriteToLevel.\n//  2. If the checkpoint format is \"wal\", also forwarded to the WAL staging\n//     goroutine via the WALMessages channel for durable write-ahead logging.\npackage metricstore\n\nimport (\n\t\"bytes\"\n\t\"context\"\n\t\"fmt\"\n\t\"sync\"\n\t\"time\"\n\n\tcclog \"github.com/ClusterCockpit/cc-lib/v2/ccLogger\"\n\t\"github.com/ClusterCockpit/cc-lib/v2/nats\"\n\t\"github.com/ClusterCockpit/cc-lib/v2/schema\"\n\t\"github.com/ClusterCockpit/cc-line-protocol/v2/lineprotocol\"\n)\n\n// ReceiveNats subscribes to all configured NATS subjects and feeds incoming\n// line-protocol messages into the MemoryStore.\n//\n// When workers > 1 a pool of goroutines drains a shared channel so that\n// multiple messages can be decoded in parallel. With workers == 1 the NATS\n// callback decodes inline (no channel overhead, lower latency).\n//\n// The function blocks until ctx is cancelled and all worker goroutines have\n// finished. It returns nil when the NATS client is not configured; callers\n// should treat that as a no-op rather than an error.\nfunc ReceiveNats(ms *MemoryStore,\n\tworkers int,\n\tctx context.Context,\n) error {\n\tnc := nats.GetClient()\n\n\tif nc == nil {\n\t\tcclog.Warn(\"NATS client not initialized\")\n\t\treturn nil\n\t}\n\n\tvar wg sync.WaitGroup\n\tmsgs := make(chan []byte, workers*2)\n\n\tfor _, sc := range *Keys.Subscriptions {\n\t\tclusterTag := sc.ClusterTag\n\t\tif workers > 1 {\n\t\t\twg.Add(workers)\n\n\t\t\tfor range workers {\n\t\t\t\tgo func() {\n\t\t\t\t\tdefer wg.Done()\n\t\t\t\t\tfor m := range msgs {\n\t\t\t\t\t\tdec := lineprotocol.NewDecoderWithBytes(m)\n\t\t\t\t\t\tif err := DecodeLine(dec, ms, clusterTag); err != nil {\n\t\t\t\t\t\t\tcclog.Errorf(\"error: %s\", err.Error())\n\t\t\t\t\t\t}\n\t\t\t\t\t}\n\t\t\t\t}()\n\t\t\t}\n\n\t\t\tnc.Subscribe(sc.SubscribeTo, func(subject string, data []byte) {\n\t\t\t\tselect {\n\t\t\t\tcase msgs <- data:\n\t\t\t\tcase <-ctx.Done():\n\t\t\t\t}\n\t\t\t})\n\t\t} else {\n\t\t\tnc.Subscribe(sc.SubscribeTo, func(subject string, data []byte) {\n\t\t\t\tdec := lineprotocol.NewDecoderWithBytes(data)\n\t\t\t\tif err := DecodeLine(dec, ms, clusterTag); err != nil {\n\t\t\t\t\tcclog.Errorf(\"error: %s\", err.Error())\n\t\t\t\t}\n\t\t\t})\n\t\t}\n\t\tcclog.Infof(\"NATS subscription to '%s' established\", sc.SubscribeTo)\n\t}\n\n\tgo func() {\n\t\t<-ctx.Done()\n\t\tclose(msgs)\n\t}()\n\n\twg.Wait()\n\n\treturn nil\n}\n\n// reorder prepends prefix to buf in-place when buf has enough spare capacity,\n// avoiding an allocation. Falls back to a regular append otherwise.\n//\n// It is used to assemble the \"type<type-id>\" and \"subtype<stype-id>\" selector\n// strings when the type tag arrives before the type-id tag in the line, so the\n// two byte slices need to be concatenated in tag-declaration order regardless\n// of wire order.\nfunc reorder(buf, prefix []byte) []byte {\n\tn := len(prefix)\n\tm := len(buf)\n\tif cap(buf) < m+n {\n\t\treturn append(prefix[:n:n], buf...)\n\t} else {\n\t\tbuf = buf[:n+m]\n\t\tfor i := m - 1; i >= 0; i-- {\n\t\t\tbuf[i+n] = buf[i]\n\t\t}\n\t\tfor i := range n {\n\t\t\tbuf[i] = prefix[i]\n\t\t}\n\t\treturn buf\n\t}\n}\n\n// decodeState holds the per-call scratch buffers used by DecodeLine.\n// Instances are recycled via decodeStatePool to avoid repeated allocations\n// during high-throughput ingestion.\ntype decodeState struct {\n\t// metricBuf holds a copy of the current measurement name (line-protocol\n\t// measurement field). Copied because dec.Measurement() returns a slice\n\t// that is invalidated by the next decoder call.\n\tmetricBuf []byte\n\n\t// selector is the sub-device path passed to WriteToLevel and WALMessage\n\t// (e.g. [\"socket0\"] or [\"socket0\", \"memctrl1\"]). Reused across lines.\n\tselector []string\n\n\t// typeBuf accumulates the concatenated \"type\"+\"type-id\" tag value for the\n\t// current line. Reset at the start of each line's tag-decode loop.\n\ttypeBuf []byte\n\n\t// subTypeBuf accumulates the concatenated \"subtype\"+\"stype-id\" tag value.\n\t// Reset at the start of each line's tag-decode loop.\n\tsubTypeBuf []byte\n\n\t// prevTypeBytes / prevTypeStr cache the last seen typeBuf content and its\n\t// string conversion. Because consecutive lines in a batch typically address\n\t// the same sub-device, the cache hit rate is very high and avoids\n\t// repeated []byte→string allocations.\n\tprevTypeBytes []byte\n\tprevTypeStr   string\n\n\t// prevSubTypeBytes / prevSubTypeStr are the same cache for the subtype.\n\tprevSubTypeBytes []byte\n\tprevSubTypeStr   string\n}\n\n// decodeStatePool recycles decodeState values across DecodeLine calls to\n// reduce GC pressure during sustained metric ingestion.\nvar decodeStatePool = sync.Pool{\n\tNew: func() any {\n\t\treturn &decodeState{\n\t\t\tmetricBuf:  make([]byte, 0, 16),\n\t\t\tselector:   make([]string, 0, 4),\n\t\t\ttypeBuf:    make([]byte, 0, 16),\n\t\t\tsubTypeBuf: make([]byte, 0, 16),\n\t\t}\n\t},\n}\n\n// DecodeLine reads all lines from dec (InfluxDB line-protocol) and writes each\n// decoded metric sample into ms.\n//\n// clusterDefault is used as the cluster name for lines that do not carry a\n// \"cluster\" tag. Callers typically supply the ClusterTag value from the NATS\n// subscription configuration.\n//\n// Performance notes:\n//   - A decodeState is obtained from decodeStatePool to reuse scratch buffers.\n//   - The Level pointer (host-level node in the metric tree) is cached across\n//     consecutive lines that share the same cluster+host pair to avoid\n//     repeated lock acquisitions on the root and cluster levels.\n//   - []byte→string conversions for type/subtype selectors are cached via\n//     prevType*/prevSubType* fields because batches typically repeat the same\n//     sub-device identifiers.\n//   - Timestamp parsing tries Second precision first; if that fails it retries\n//     Millisecond, Microsecond, and Nanosecond in turn. A missing timestamp\n//     falls back to time.Now().\n//\n// When the checkpoint format is \"wal\" each successfully decoded sample is also\n// sent to WALMessages so the WAL staging goroutine can persist it durably\n// before the next binary snapshot.\nfunc DecodeLine(dec *lineprotocol.Decoder,\n\tms *MemoryStore,\n\tclusterDefault string,\n) error {\n\t// Reduce allocations in loop:\n\tt := time.Now()\n\tmetric := Metric{}\n\tst := decodeStatePool.Get().(*decodeState)\n\tdefer decodeStatePool.Put(st)\n\n\t// Optimize for the case where all lines in a \"batch\" are about the same\n\t// cluster and host. By using `WriteToLevel` (level = host), we do not need\n\t// to take the root- and cluster-level lock as often.\n\tvar lvl *Level = nil\n\tprevCluster, prevHost := \"\", \"\"\n\n\tvar ok bool\n\tfor dec.Next() {\n\t\trawmeasurement, err := dec.Measurement()\n\t\tif err != nil {\n\t\t\treturn err\n\t\t}\n\n\t\t// Needs to be copied because another call to dec.* would\n\t\t// invalidate the returned slice.\n\t\tst.metricBuf = append(st.metricBuf[:0], rawmeasurement...)\n\n\t\t// The go compiler optimizes map[string(byteslice)] lookups:\n\t\tmetric.MetricConfig, ok = ms.Metrics[string(rawmeasurement)]\n\t\tif !ok {\n\t\t\tcontinue\n\t\t}\n\n\t\tst.typeBuf, st.subTypeBuf = st.typeBuf[:0], st.subTypeBuf[:0]\n\t\tcluster, host := clusterDefault, \"\"\n\t\tfor {\n\t\t\tkey, val, err := dec.NextTag()\n\t\t\tif err != nil {\n\t\t\t\treturn err\n\t\t\t}\n\t\t\tif key == nil {\n\t\t\t\tbreak\n\t\t\t}\n\n\t\t\t// The go compiler optimizes string([]byte{...}) == \"...\":\n\t\t\tswitch string(key) {\n\t\t\tcase \"cluster\":\n\t\t\t\tif string(val) == prevCluster {\n\t\t\t\t\tcluster = prevCluster\n\t\t\t\t} else {\n\t\t\t\t\tcluster = string(val)\n\t\t\t\t\tlvl = nil\n\t\t\t\t}\n\t\t\tcase \"hostname\", \"host\":\n\t\t\t\tif string(val) == prevHost {\n\t\t\t\t\thost = prevHost\n\t\t\t\t} else {\n\t\t\t\t\thost = string(val)\n\t\t\t\t\tlvl = nil\n\t\t\t\t}\n\t\t\tcase \"type\":\n\t\t\t\tif string(val) == \"node\" {\n\t\t\t\t\tbreak\n\t\t\t\t}\n\n\t\t\t\t// We cannot be sure that the \"type\" tag comes before the \"type-id\" tag:\n\t\t\t\tif len(st.typeBuf) == 0 {\n\t\t\t\t\tst.typeBuf = append(st.typeBuf, val...)\n\t\t\t\t} else {\n\t\t\t\t\tst.typeBuf = reorder(st.typeBuf, val)\n\t\t\t\t}\n\t\t\tcase \"type-id\":\n\t\t\t\tst.typeBuf = append(st.typeBuf, val...)\n\t\t\tcase \"subtype\":\n\t\t\t\t// We cannot be sure that the \"subtype\" tag comes before the \"stype-id\" tag:\n\t\t\t\tif len(st.subTypeBuf) == 0 {\n\t\t\t\t\tst.subTypeBuf = append(st.subTypeBuf, val...)\n\t\t\t\t} else {\n\t\t\t\t\tst.subTypeBuf = reorder(st.subTypeBuf, val)\n\t\t\t\t}\n\t\t\tcase \"stype-id\":\n\t\t\t\tst.subTypeBuf = append(st.subTypeBuf, val...)\n\t\t\tdefault:\n\t\t\t}\n\t\t}\n\n\t\t// If the cluster or host changed, the lvl was set to nil\n\t\tif lvl == nil {\n\t\t\tst.selector = st.selector[:2]\n\t\t\tst.selector[0], st.selector[1] = cluster, host\n\t\t\tlvl = ms.GetLevel(st.selector)\n\t\t\tprevCluster, prevHost = cluster, host\n\t\t}\n\n\t\t// subtypes: cache []byte→string conversions; messages in a batch typically\n\t\t// share the same type/subtype so the hit rate is very high.\n\t\tst.selector = st.selector[:0]\n\t\tif len(st.typeBuf) > 0 {\n\t\t\tif !bytes.Equal(st.typeBuf, st.prevTypeBytes) {\n\t\t\t\tst.prevTypeBytes = append(st.prevTypeBytes[:0], st.typeBuf...)\n\t\t\t\tst.prevTypeStr = string(st.typeBuf)\n\t\t\t}\n\t\t\tst.selector = append(st.selector, st.prevTypeStr)\n\t\t\tif len(st.subTypeBuf) > 0 {\n\t\t\t\tif !bytes.Equal(st.subTypeBuf, st.prevSubTypeBytes) {\n\t\t\t\t\tst.prevSubTypeBytes = append(st.prevSubTypeBytes[:0], st.subTypeBuf...)\n\t\t\t\t\tst.prevSubTypeStr = string(st.subTypeBuf)\n\t\t\t\t}\n\t\t\t\tst.selector = append(st.selector, st.prevSubTypeStr)\n\t\t\t}\n\t\t}\n\n\t\tfor {\n\t\t\tkey, val, err := dec.NextField()\n\t\t\tif err != nil {\n\t\t\t\treturn err\n\t\t\t}\n\n\t\t\tif key == nil {\n\t\t\t\tbreak\n\t\t\t}\n\n\t\t\tif string(key) != \"value\" {\n\t\t\t\treturn fmt.Errorf(\"host %s: unknown field: '%s' (value: %#v)\", host, string(key), val)\n\t\t\t}\n\n\t\t\tif val.Kind() == lineprotocol.Float {\n\t\t\t\tmetric.Value = schema.Float(val.FloatV())\n\t\t\t} else if val.Kind() == lineprotocol.Int {\n\t\t\t\tmetric.Value = schema.Float(val.IntV())\n\t\t\t} else if val.Kind() == lineprotocol.Uint {\n\t\t\t\tmetric.Value = schema.Float(val.UintV())\n\t\t\t} else {\n\t\t\t\treturn fmt.Errorf(\"host %s: unsupported value type in message: %s\", host, val.Kind().String())\n\t\t\t}\n\t\t}\n\n\t\tif t, err = dec.Time(lineprotocol.Second, t); err != nil {\n\t\t\tt = time.Now()\n\t\t\tif t, err = dec.Time(lineprotocol.Millisecond, t); err != nil {\n\t\t\t\tt = time.Now()\n\t\t\t\tif t, err = dec.Time(lineprotocol.Microsecond, t); err != nil {\n\t\t\t\t\tt = time.Now()\n\t\t\t\t\tif t, err = dec.Time(lineprotocol.Nanosecond, t); err != nil {\n\t\t\t\t\t\treturn fmt.Errorf(\"host %s: timestamp : %#v with error : %#v\", host, t, err.Error())\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\n\t\tif err != nil {\n\t\t\treturn fmt.Errorf(\"host %s: timestamp : %#v with error : %#v\", host, t, err.Error())\n\t\t}\n\n\t\ttime := t.Unix()\n\n\t\tif Keys.Checkpoints.FileFormat == \"wal\" {\n\t\t\tWALMessages <- &WALMessage{\n\t\t\t\tMetricName: string(st.metricBuf),\n\t\t\t\tCluster:    cluster,\n\t\t\t\tNode:       host,\n\t\t\t\tSelector:   append([]string{}, st.selector...),\n\t\t\t\tValue:      metric.Value,\n\t\t\t\tTimestamp:  time,\n\t\t\t}\n\t\t}\n\n\t\tif err := ms.WriteToLevel(lvl, st.selector, time, []Metric{metric}); err != nil {\n\t\t\treturn err\n\t\t}\n\t}\n\treturn nil\n}\n","structuredPatch":[{"oldStart":359,"oldLines":7,"newStart":359,"newLines":8,"lines":["     }"," ","     if err := ms.WriteToLevel(lvl, st.selector, time, []Metric{metric}); err != nil {","-      return err","+      cclog.Warnf(\"write error for host %s metric %s at ts %d: %s\", host, string(st.metricBuf), time, err.Error())","+      continue","     }","   }","   return nil"]}],"userModified":false,"replaceAll":false},"sourceToolAssistantUUID":"df4037d3-6a82-4eea-9bae-efbec8eacebe","userType":"external","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"39705f8c-1691-4d60-b0aa-39f588ed9dcf","version":"2.1.74","gitBranch":"hotfix","slug":"linear-roaming-glade"}
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{"parentUuid":"9f470e40-bc08-4d81-9d05-919e75bd7284","isSidechain":false,"promptId":"a631224c-8362-4377-bee6-9ff6c4b66c68","type":"user","message":{"role":"user","content":[{"tool_use_id":"toolu_01KF9gv6E24K5xZHzRS4eXMv","type":"tool_result","content":"The file /Users/jan/prg/ClusterCockpit/cc-backend/pkg/metricstore/buffer.go has been updated successfully."}]},"uuid":"06ea9a13-f087-42df-89de-e75b9ce34515","timestamp":"2026-03-13T06:52:02.843Z","toolUseResult":{"filePath":"/Users/jan/prg/ClusterCockpit/cc-backend/pkg/metricstore/buffer.go","oldString":"func (b *buffer) count() int64 {\n\tvar res int64\n\tfor ; b != nil; b = b.prev {\n\t\tres += int64(len(b.data))\n\t}\n\treturn res\n}","newString":"func (b *buffer) count() int64 {\n\tvar res int64\n\tfor ; b != nil; b = b.prev {\n\t\tres += int64(len(b.data))\n\t}\n\treturn res\n}\n\n// bufferCount returns the number of buffer nodes in the linked list.\nfunc (b *buffer) bufferCount() int64 {\n\tvar n int64\n\tfor ; b != nil; b = b.prev {\n\t\tn++\n\t}\n\treturn n\n}","originalFile":"// Copyright (C) NHR@FAU, University Erlangen-Nuremberg.\n// All rights reserved. This file is part of cc-backend.\n// Use of this source code is governed by a MIT-style\n// license that can be found in the LICENSE file.\n\n// Package metricstore provides buffer.go: Time-series data buffer implementation.\n//\n// # Buffer Architecture\n//\n// Each metric at each hierarchical level (cluster/host/cpu/etc.) uses a linked-list\n// chain of fixed-size buffers to store time-series data. This design:\n//\n//   - Avoids reallocation/copying when growing (new links added instead)\n//   - Enables efficient pooling (buffers returned to sync.Pool)\n//   - Supports traversal back in time (via prev pointers)\n//   - Maintains temporal ordering (newer data in later buffers)\n//\n// # Buffer Chain Example\n//\n//\t[oldest buffer] <- prev -- [older] <- prev -- [newest buffer (head)]\n//\t  start=1000               start=1512           start=2024\n//\t  data=[v0...v511]         data=[v0...v511]     data=[v0...v42]\n//\n// When the head buffer reaches capacity (BufferCap = 512), a new buffer becomes\n// the new head and the old head is linked via prev.\n//\n// # Pooling Strategy\n//\n// sync.Pool reduces GC pressure for the common case (BufferCap-sized allocations).\n// Non-standard capacity buffers are not pooled (e.g., from checkpoint deserialization).\n//\n// # Time Alignment\n//\n// Timestamps are aligned to measurement frequency intervals:\n//\n//\tindex = (timestamp - buffer.start) / buffer.frequency\n//\tactualTime = buffer.start + (frequency / 2) + (index * frequency)\n//\n// Missing data points are represented as NaN values. The read() function performs\n// linear interpolation where possible.\npackage metricstore\n\nimport (\n\t\"errors\"\n\t\"sync\"\n\t\"time\"\n\n\t\"github.com/ClusterCockpit/cc-lib/v2/schema\"\n)\n\n// BufferCap is the default buffer capacity.\n// buffer.data will only ever grow up to its capacity and a new link\n// in the buffer chain will be created if needed so that no copying\n// of data or reallocation needs to happen on writes.\nconst BufferCap int = DefaultBufferCapacity\n\n// BufferPool is the global instance.\n// It is initialized immediately when the package loads.\nvar bufferPool = NewPersistentBufferPool()\n\ntype PersistentBufferPool struct {\n\tpool []*buffer\n\tmu   sync.Mutex\n}\n\n// NewPersistentBufferPool creates a dynamic pool for buffers.\nfunc NewPersistentBufferPool() *PersistentBufferPool {\n\treturn &PersistentBufferPool{\n\t\tpool: make([]*buffer, 0),\n\t}\n}\n\nfunc (p *PersistentBufferPool) Get() *buffer {\n\tp.mu.Lock()\n\tdefer p.mu.Unlock()\n\n\tn := len(p.pool)\n\tif n == 0 {\n\t\t// Pool is empty, allocate a new one\n\t\treturn &buffer{\n\t\t\tdata: make([]schema.Float, 0, BufferCap),\n\t\t}\n\t}\n\n\t// Reuse existing buffer from the pool\n\tb := p.pool[n-1]\n\tp.pool[n-1] = nil // Avoid memory leak\n\tp.pool = p.pool[:n-1]\n\treturn b\n}\n\n// Put returns b to the pool. The caller must set b.lastUsed = time.Now().Unix()\n// before calling Put so that Clean() can evict idle entries correctly.\nfunc (p *PersistentBufferPool) Put(b *buffer) {\n\t// Reset the buffer before putting it back\n\tb.data = b.data[:0]\n\n\tp.mu.Lock()\n\tdefer p.mu.Unlock()\n\n\tp.pool = append(p.pool, b)\n}\n\n// GetSize returns the exact number of buffers currently sitting in the pool.\nfunc (p *PersistentBufferPool) GetSize() int {\n\tp.mu.Lock()\n\tdefer p.mu.Unlock()\n\treturn len(p.pool)\n}\n\n// Clear drains all buffers currently in the pool, allowing the GC to collect them.\nfunc (p *PersistentBufferPool) Clear() {\n\tp.mu.Lock()\n\tdefer p.mu.Unlock()\n\tfor i := range p.pool {\n\t\tp.pool[i] = nil\n\t}\n\tp.pool = p.pool[:0]\n}\n\n// Clean removes buffers from the pool that haven't been used in the given duration.\n// It uses a simple LRU approach based on the lastUsed timestamp.\nfunc (p *PersistentBufferPool) Clean(threshold int64) {\n\tp.mu.Lock()\n\tdefer p.mu.Unlock()\n\n\t// Filter in place, retaining only buffers returned to the pool recently enough.\n\tactive := p.pool[:0]\n\tfor _, b := range p.pool {\n\t\tif b.lastUsed >= threshold {\n\t\t\tactive = append(active, b)\n\t\t}\n\t}\n\n\t// Nullify the rest to prevent memory leaks\n\tfor i := len(active); i < len(p.pool); i++ {\n\t\tp.pool[i] = nil\n\t}\n\n\tp.pool = active\n}\n\nvar (\n\t// ErrNoData indicates no time-series data exists for the requested metric/level.\n\tErrNoData error = errors.New(\"[METRICSTORE]> no data for this metric/level\")\n\n\t// ErrDataDoesNotAlign indicates that aggregated data from child scopes\n\t// does not align with the parent scope's expected timestamps/intervals.\n\tErrDataDoesNotAlign error = errors.New(\"[METRICSTORE]> data from lower granularities does not align\")\n)\n\n// buffer stores time-series data for a single metric at a specific hierarchical level.\n//\n// Buffers form doubly-linked chains ordered by time. When capacity is reached,\n// a new buffer becomes the head and the old head is linked via prev/next.\n//\n// Fields:\n//   - prev:      Link to older buffer in the chain (nil if this is oldest)\n//   - next:      Link to newer buffer in the chain (nil if this is newest/head)\n//   - data:      Time-series values (schema.Float supports NaN for missing data)\n//   - frequency: Measurement interval in seconds\n//   - start:     Start timestamp (adjusted by -frequency/2 for alignment)\n//   - archived:  True if data has been persisted to disk archive\n//   - closed:    True if buffer is no longer accepting writes\n//\n// Index calculation: index = (timestamp - start) / frequency\n// Actual data timestamp: start + (frequency / 2) + (index * frequency)\ntype buffer struct {\n\tprev      *buffer\n\tnext      *buffer\n\tdata      []schema.Float\n\tfrequency int64\n\tstart     int64\n\tarchived  bool\n\tclosed    bool\n\tlastUsed  int64\n}\n\nfunc newBuffer(ts, freq int64) *buffer {\n\tb := bufferPool.Get()\n\tb.frequency = freq\n\tb.start = ts - (freq / 2)\n\tb.prev = nil\n\tb.next = nil\n\tb.archived = false\n\tb.closed = false\n\tb.data = b.data[:0]\n\treturn b\n}\n\n// write appends a timestamped value to the buffer chain.\n//\n// Returns the head buffer (which may be newly created if capacity was reached).\n// Timestamps older than the buffer's start are rejected. If the calculated index\n// exceeds capacity, a new buffer is allocated and linked as the new head.\n//\n// Missing timestamps are automatically filled with NaN values to maintain alignment.\n// Overwrites are allowed if the index is already within the existing data slice.\n//\n// Parameters:\n//   - ts:    Unix timestamp in seconds\n//   - value: Metric value (can be schema.NaN for missing data)\n//\n// Returns:\n//   - *buffer: The new head buffer (same as b if no new buffer created)\n//   - error:   Non-nil if timestamp is before buffer start\nfunc (b *buffer) write(ts int64, value schema.Float) (*buffer, error) {\n\tif ts < b.start {\n\t\treturn nil, errors.New(\"[METRICSTORE]> cannot write value to buffer from past\")\n\t}\n\n\t// idx := int((ts - b.start + (b.frequency / 3)) / b.frequency)\n\tidx := int((ts - b.start) / b.frequency)\n\tif idx >= cap(b.data) {\n\t\tnewbuf := newBuffer(ts, b.frequency)\n\t\tnewbuf.prev = b\n\t\tb.next = newbuf\n\t\tb = newbuf\n\t\tidx = 0\n\t}\n\n\t// Overwriting value or writing value from past\n\tif idx < len(b.data) {\n\t\tb.data[idx] = value\n\t\treturn b, nil\n\t}\n\n\t// Fill up unwritten slots with NaN\n\tfor i := len(b.data); i < idx; i++ {\n\t\tb.data = append(b.data, schema.NaN)\n\t}\n\n\tb.data = append(b.data, value)\n\treturn b, nil\n}\n\nfunc (b *buffer) end() int64 {\n\treturn b.firstWrite() + int64(len(b.data))*b.frequency\n}\n\nfunc (b *buffer) firstWrite() int64 {\n\treturn b.start + (b.frequency / 2)\n}\n\n// read retrieves time-series data from the buffer chain for the specified time range.\n//\n// Traverses the buffer chain backwards (via prev links) if 'from' precedes the current\n// buffer's start. Missing data points are represented as NaN. Values are accumulated\n// into the provided 'data' slice (using +=, so caller must zero-initialize if needed).\n//\n// The function adjusts the actual time range returned if data is unavailable at the\n// boundaries (returned via adjusted from/to timestamps).\n//\n// Parameters:\n//   - from: Start timestamp (Unix seconds)\n//   - to:   End timestamp (Unix seconds, exclusive)\n//   - data: Pre-allocated slice to accumulate results (must be large enough)\n//\n// Returns:\n//   - []schema.Float: Slice of data (may be shorter than input 'data' slice)\n//   - int64:          Actual start timestamp with available data\n//   - int64:          Actual end timestamp (exclusive)\n//   - error:          Non-nil on failure\n//\n// Panics if 'data' slice is too small to hold all values in [from, to).\nfunc (b *buffer) read(from, to int64, data []schema.Float) ([]schema.Float, int64, int64, error) {\n\t// Walk back to the buffer that covers 'from', adjusting if we hit the oldest.\n\tfor from < b.firstWrite() {\n\t\tif b.prev == nil {\n\t\t\tfrom = b.firstWrite()\n\t\t\tbreak\n\t\t}\n\t\tb = b.prev\n\t}\n\n\ti := 0\n\tt := from\n\tfor ; t < to; t += b.frequency {\n\t\tidx := int((t - b.start) / b.frequency)\n\t\tif idx >= cap(b.data) {\n\t\t\tif b.next == nil {\n\t\t\t\tbreak\n\t\t\t}\n\t\t\tb = b.next\n\t\t\t// Recalculate idx in the new buffer; a gap between buffers may exist.\n\t\t\tidx = int((t - b.start) / b.frequency)\n\t\t}\n\n\t\tif idx >= len(b.data) {\n\t\t\tif b.next == nil || to <= b.next.start {\n\t\t\t\tbreak\n\t\t\t}\n\t\t\tdata[i] += schema.NaN // NaN + anything = NaN; propagates missing data\n\t\t} else if t < b.start {\n\t\t\tdata[i] += schema.NaN // gap before this buffer's first write\n\t\t} else {\n\t\t\tdata[i] += b.data[idx]\n\t\t}\n\t\ti++\n\t}\n\n\treturn data[:i], from, t, nil\n}\n\n// free removes buffers older than the specified timestamp from the chain.\n//\n// Recursively traverses backwards (via prev) and unlinks buffers whose end time\n// is before the retention threshold. Freed buffers are returned to the pool if\n// they have the standard capacity (BufferCap).\n//\n// Parameters:\n//   - t: Retention threshold timestamp (Unix seconds)\n//\n// Returns:\n//   - delme: True if the current buffer itself should be deleted by caller\n//   - n:     Number of buffers freed in this subtree\nfunc (b *buffer) free(t int64) (delme bool, n int) {\n\tif b.prev != nil {\n\t\tdelme, m := b.prev.free(t)\n\t\tn += m\n\t\tif delme {\n\t\t\tb.prev.next = nil\n\t\t\tif cap(b.prev.data) != BufferCap {\n\t\t\t\tb.prev.data = make([]schema.Float, 0, BufferCap)\n\t\t\t}\n\t\t\tb.prev.lastUsed = time.Now().Unix()\n\t\t\tbufferPool.Put(b.prev)\n\t\t\tb.prev = nil\n\t\t}\n\t}\n\n\tend := b.end()\n\tif end < t {\n\t\treturn true, n + 1\n\t}\n\n\treturn false, n\n}\n\n// forceFreeOldest recursively finds the end of the linked list (the oldest buffer)\n// and removes it.\n// Returns:\n//\n//\tdelme: true if 'b' itself is the oldest and should be removed by the caller\n//\tn:     the number of buffers freed (will be 1 or 0)\nfunc (b *buffer) forceFreeOldest() (delme bool, n int) {\n\t// If there is a previous buffer, recurse down to find the oldest\n\tif b.prev != nil {\n\t\tdelPrev, freed := b.prev.forceFreeOldest()\n\n\t\t// If the previous buffer signals it should be deleted:\n\t\tif delPrev {\n\t\t\tb.prev.next = nil\n\t\t\tif cap(b.prev.data) != BufferCap {\n\t\t\t\tb.prev.data = make([]schema.Float, 0, BufferCap)\n\t\t\t}\n\t\t\tb.prev.lastUsed = time.Now().Unix()\n\t\t\tbufferPool.Put(b.prev)\n\t\t\tb.prev = nil\n\t\t}\n\t\treturn false, freed\n\t}\n\n\t// If b.prev is nil, THIS buffer is the oldest.\n\t// We return true so the parent (or the Level loop) knows to delete reference to 'b'.\n\treturn true, 1\n}\n\n// iterFromTo invokes callback on every buffer in the chain that overlaps [from, to].\n//\n// Traverses backwards (via prev) first, then processes current buffer if it overlaps\n// the time range. Used for checkpoint/archive operations that need to serialize buffers\n// within a specific time window.\n//\n// Parameters:\n//   - from:     Start timestamp (Unix seconds, inclusive)\n//   - to:       End timestamp (Unix seconds, inclusive)\n//   - callback: Function to invoke on each overlapping buffer\n//\n// Returns:\n//   - error: First error returned by callback, or nil if all succeeded\nfunc (b *buffer) iterFromTo(from, to int64, callback func(b *buffer) error) error {\n\tif b == nil {\n\t\treturn nil\n\t}\n\n\t// Collect overlapping buffers walking backwards (newest → oldest).\n\tvar matching []*buffer\n\tfor cur := b; cur != nil; cur = cur.prev {\n\t\tif from <= cur.end() && cur.start <= to {\n\t\t\tmatching = append(matching, cur)\n\t\t}\n\t}\n\n\t// Invoke callback in chronological order (oldest → newest).\n\tfor i := len(matching) - 1; i >= 0; i-- {\n\t\tif err := callback(matching[i]); err != nil {\n\t\t\treturn err\n\t\t}\n\t}\n\treturn nil\n}\n\nfunc (b *buffer) count() int64 {\n\tvar res int64\n\tfor ; b != nil; b = b.prev {\n\t\tres += int64(len(b.data))\n\t}\n\treturn res\n}\n","structuredPatch":[{"oldStart":408,"oldLines":3,"newStart":408,"newLines":12,"lines":["   }","   return res"," }","+","+// bufferCount returns the number of buffer nodes in the linked list.","+func (b *buffer) bufferCount() int64 {","+  var n int64","+  for ; b != nil; b = b.prev {","+    n++","+  }","+  return n","+}"]}],"userModified":false,"replaceAll":false},"sourceToolAssistantUUID":"9f470e40-bc08-4d81-9d05-919e75bd7284","userType":"external","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"39705f8c-1691-4d60-b0aa-39f588ed9dcf","version":"2.1.74","gitBranch":"hotfix","slug":"linear-roaming-glade"}
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{"parentUuid":"79198516-71fc-4424-a312-b44632b3f87f","isSidechain":false,"message":{"model":"claude-opus-4-6","id":"msg_0148yKKvBB2duXwfUCJsPt9j","type":"message","role":"assistant","content":[{"type":"tool_use","id":"toolu_01UUn8nhAqXAbzCAkQAaoti6","name":"Edit","input":{"replace_all":false,"file_path":"/Users/jan/prg/ClusterCockpit/cc-backend/pkg/metricstore/level.go","old_string":"func (l *Level) free(t int64) (int, error) {\n\tl.lock.Lock()\n\tdefer l.lock.Unlock()\n\n\tn := 0\n\tfor i, b := range l.metrics {\n\t\tif b != nil {\n\t\t\tdelme, m := b.free(t)\n\t\t\tn += m\n\t\t\tif delme {\n\t\t\t\tif cap(b.data) != BufferCap {\n\t\t\t\t\tb.data = make([]schema.Float, 0, BufferCap)\n\t\t\t\t}\n\t\t\t\tb.lastUsed = time.Now().Unix()\n\t\t\t\tbufferPool.Put(b)\n\t\t\t\tl.metrics[i] = nil\n\t\t\t}\n\t\t}\n\t}\n\n\tfor _, l := range l.children {\n\t\tm, err := l.free(t)\n\t\tn += m\n\t\tif err != nil {\n\t\t\treturn n, err\n\t\t}\n\t}\n\n\treturn n, nil\n}","new_string":"func (l *Level) free(t int64) (int, error) {\n\tl.lock.Lock()\n\tdefer l.lock.Unlock()\n\n\tn := 0\n\tfor i, b := range l.metrics {\n\t\tif b != nil {\n\t\t\tdelme, m := b.free(t)\n\t\t\tn += m\n\t\t\tif delme {\n\t\t\t\tif cap(b.data) != BufferCap {\n\t\t\t\t\tb.data = make([]schema.Float, 0, BufferCap)\n\t\t\t\t}\n\t\t\t\tb.lastUsed = time.Now().Unix()\n\t\t\t\tbufferPool.Put(b)\n\t\t\t\tl.metrics[i] = nil\n\t\t\t}\n\t\t}\n\t}\n\n\tfor key, child := range l.children {\n\t\tm, err := child.free(t)\n\t\tn += m\n\t\tif err != nil {\n\t\t\treturn n, err\n\t\t}\n\t\tif child.isEmpty() {\n\t\t\tdelete(l.children, key)\n\t\t}\n\t}\n\n\treturn n, nil\n}\n\n// isEmpty returns true if this level has no metrics and no children.\nfunc (l *Level) isEmpty() bool {\n\tl.lock.RLock()\n\tdefer l.lock.RUnlock()\n\n\tfor _, b := range l.metrics {\n\t\tif b != nil {\n\t\t\treturn false\n\t\t}\n\t}\n\treturn len(l.children) == 0\n}"},"caller":{"type":"direct"}}],"stop_reason":"tool_use","stop_sequence":null,"usage":{"input_tokens":1,"cache_creation_input_tokens":367,"cache_read_input_tokens":49539,"output_tokens":710,"server_tool_use":{"web_search_requests":0,"web_fetch_requests":0},"service_tier":"standard","cache_creation":{"ephemeral_1h_input_tokens":367,"ephemeral_5m_input_tokens":0},"inference_geo":"","iterations":[],"speed":"standard"}},"requestId":"req_011CYzdubMR3r6thSosDD2P2","type":"assistant","uuid":"e7c1f488-8287-43d2-8f41-e704e8d3563b","timestamp":"2026-03-13T06:52:12.132Z","userType":"external","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"39705f8c-1691-4d60-b0aa-39f588ed9dcf","version":"2.1.74","gitBranch":"hotfix","slug":"linear-roaming-glade"}
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{"parentUuid":"e7c1f488-8287-43d2-8f41-e704e8d3563b","isSidechain":false,"promptId":"a631224c-8362-4377-bee6-9ff6c4b66c68","type":"user","message":{"role":"user","content":[{"tool_use_id":"toolu_01UUn8nhAqXAbzCAkQAaoti6","type":"tool_result","content":"The file /Users/jan/prg/ClusterCockpit/cc-backend/pkg/metricstore/level.go has been updated successfully."}]},"uuid":"2c115c86-2837-48cb-a488-549d6c9e16b0","timestamp":"2026-03-13T06:52:12.145Z","toolUseResult":{"filePath":"/Users/jan/prg/ClusterCockpit/cc-backend/pkg/metricstore/level.go","oldString":"func (l *Level) free(t int64) (int, error) {\n\tl.lock.Lock()\n\tdefer l.lock.Unlock()\n\n\tn := 0\n\tfor i, b := range l.metrics {\n\t\tif b != nil {\n\t\t\tdelme, m := b.free(t)\n\t\t\tn += m\n\t\t\tif delme {\n\t\t\t\tif cap(b.data) != BufferCap {\n\t\t\t\t\tb.data = make([]schema.Float, 0, BufferCap)\n\t\t\t\t}\n\t\t\t\tb.lastUsed = time.Now().Unix()\n\t\t\t\tbufferPool.Put(b)\n\t\t\t\tl.metrics[i] = nil\n\t\t\t}\n\t\t}\n\t}\n\n\tfor _, l := range l.children {\n\t\tm, err := l.free(t)\n\t\tn += m\n\t\tif err != nil {\n\t\t\treturn n, err\n\t\t}\n\t}\n\n\treturn n, nil\n}","newString":"func (l *Level) free(t int64) (int, error) {\n\tl.lock.Lock()\n\tdefer l.lock.Unlock()\n\n\tn := 0\n\tfor i, b := range l.metrics {\n\t\tif b != nil {\n\t\t\tdelme, m := b.free(t)\n\t\t\tn += m\n\t\t\tif delme {\n\t\t\t\tif cap(b.data) != BufferCap {\n\t\t\t\t\tb.data = make([]schema.Float, 0, BufferCap)\n\t\t\t\t}\n\t\t\t\tb.lastUsed = time.Now().Unix()\n\t\t\t\tbufferPool.Put(b)\n\t\t\t\tl.metrics[i] = nil\n\t\t\t}\n\t\t}\n\t}\n\n\tfor key, child := range l.children {\n\t\tm, err := child.free(t)\n\t\tn += m\n\t\tif err != nil {\n\t\t\treturn n, err\n\t\t}\n\t\tif child.isEmpty() {\n\t\t\tdelete(l.children, key)\n\t\t}\n\t}\n\n\treturn n, nil\n}\n\n// isEmpty returns true if this level has no metrics and no children.\nfunc (l *Level) isEmpty() bool {\n\tl.lock.RLock()\n\tdefer l.lock.RUnlock()\n\n\tfor _, b := range l.metrics {\n\t\tif b != nil {\n\t\t\treturn false\n\t\t}\n\t}\n\treturn len(l.children) == 0\n}","originalFile":"// Copyright (C) NHR@FAU, University Erlangen-Nuremberg.\n// All rights reserved. This file is part of cc-backend.\n// Use of this source code is governed by a MIT-style\n// license that can be found in the LICENSE file.\n\n// Package metricstore provides level.go: Hierarchical tree structure for metric storage.\n//\n// # Level Architecture\n//\n// The Level type forms a tree structure where each node represents a level in the\n// ClusterCockpit hierarchy: cluster → host → socket → core → hwthread, with special\n// nodes for memory domains and accelerators.\n//\n// Structure:\n//\n//\tRoot Level (cluster=\"emmy\")\n//\t├─ Level (host=\"node001\")\n//\t│  ├─ Level (socket=\"0\")\n//\t│  │  ├─ Level (core=\"0\") [stores cpu0 metrics]\n//\t│  │  └─ Level (core=\"1\") [stores cpu1 metrics]\n//\t│  └─ Level (socket=\"1\")\n//\t│     └─ ...\n//\t└─ Level (host=\"node002\")\n//\t   └─ ...\n//\n// Each Level can:\n//   - Hold data (metrics slice of buffer pointers)\n//   - Have child nodes (children map[string]*Level)\n//   - Both simultaneously (inner nodes can store aggregated metrics)\n//\n// # Selector Paths\n//\n// Selectors are hierarchical paths: []string{\"cluster\", \"host\", \"component\"}.\n// Example: []string{\"emmy\", \"node001\", \"cpu0\"} navigates to the cpu0 core level.\n//\n// # Concurrency\n//\n// RWMutex protects children map and metrics slice. Read-heavy workload (metric reads)\n// uses RLock. Writes (new levels, buffer updates) use Lock. Double-checked locking\n// prevents races during level creation.\npackage metricstore\n\nimport (\n\t\"sync\"\n\t\"time\"\n\t\"unsafe\"\n\n\t\"github.com/ClusterCockpit/cc-lib/v2/schema\"\n\t\"github.com/ClusterCockpit/cc-lib/v2/util\"\n)\n\n// Level represents a node in the hierarchical metric storage tree.\n//\n// Can be both a leaf or inner node. Inner nodes hold data in 'metrics' for aggregated\n// values (e.g., socket-level metrics derived from core-level data). Named \"Level\"\n// instead of \"node\" to avoid confusion with cluster nodes (hosts).\n//\n// Fields:\n//   - children: Map of child level names to Level pointers (e.g., \"cpu0\" → Level)\n//   - metrics:  Slice of buffer pointers (one per metric, indexed by MetricConfig.offset)\n//   - lock:     RWMutex for concurrent access (read-heavy, write-rare)\ntype Level struct {\n\tchildren map[string]*Level\n\tmetrics  []*buffer\n\tlock     sync.RWMutex\n}\n\n// findLevelOrCreate navigates to or creates the level specified by selector.\n//\n// Recursively descends the tree, creating missing levels as needed. Uses double-checked\n// locking: RLock first (fast path), then Lock if creation needed (slow path), then\n// re-check after acquiring Lock to handle races.\n//\n// Example selector: []string{\"emmy\", \"node001\", \"cpu0\"}\n// Navigates: root → emmy → node001 → cpu0, creating levels as needed.\n//\n// Parameters:\n//   - selector: Hierarchical path (consumed recursively, decreasing depth)\n//   - nMetrics: Number of metric slots to allocate in new levels\n//\n// Returns:\n//   - *Level: The target level (existing or newly created)\n//\n// Note: sync.Map may improve performance for high-concurrency writes, but current\n// approach suffices for read-heavy workload.\nfunc (l *Level) findLevelOrCreate(selector []string, nMetrics int) *Level {\n\tif len(selector) == 0 {\n\t\treturn l\n\t}\n\n\t// Allow concurrent reads:\n\tl.lock.RLock()\n\tvar child *Level\n\tvar ok bool\n\tif l.children == nil {\n\t\t// Children map needs to be created...\n\t\tl.lock.RUnlock()\n\t} else {\n\t\tchild, ok = l.children[selector[0]]\n\t\tl.lock.RUnlock()\n\t\tif ok {\n\t\t\treturn child.findLevelOrCreate(selector[1:], nMetrics)\n\t\t}\n\t}\n\n\t// The level does not exist, take write lock for unique access:\n\tl.lock.Lock()\n\t// While this thread waited for the write lock, another thread\n\t// could have created the child node.\n\tif l.children != nil {\n\t\tchild, ok = l.children[selector[0]]\n\t\tif ok {\n\t\t\tl.lock.Unlock()\n\t\t\treturn child.findLevelOrCreate(selector[1:], nMetrics)\n\t\t}\n\t}\n\n\tchild = &Level{\n\t\tmetrics:  make([]*buffer, nMetrics),\n\t\tchildren: nil,\n\t}\n\n\tif l.children != nil {\n\t\tl.children[selector[0]] = child\n\t} else {\n\t\tl.children = map[string]*Level{selector[0]: child}\n\t}\n\tl.lock.Unlock()\n\treturn child.findLevelOrCreate(selector[1:], nMetrics)\n}\n\n// collectPaths gathers all selector paths at the specified depth in the tree.\n//\n// Recursively traverses children, collecting paths when currentDepth+1 == targetDepth.\n// Each path is a selector that can be used with findLevel() or findBuffers().\n//\n// Explicitly copies slices to avoid shared underlying arrays between siblings, preventing\n// unintended mutations.\n//\n// Parameters:\n//   - currentDepth: Depth of current level (0 = root)\n//   - targetDepth:  Depth to collect paths from\n//   - currentPath:  Path accumulated so far\n//   - results:      Output slice (appended to)\n//\n// Example: collectPaths(0, 2, []string{}, &results) collects all 2-level paths\n// like []string{\"emmy\", \"node001\"}, []string{\"emmy\", \"node002\"}, etc.\nfunc (l *Level) collectPaths(currentDepth, targetDepth int, currentPath []string, results *[][]string) {\n\tl.lock.RLock()\n\tdefer l.lock.RUnlock()\n\n\tfor key, child := range l.children {\n\t\tif child == nil {\n\t\t\tcontinue\n\t\t}\n\n\t\t// We explicitly make a new slice and copy data to avoid sharing underlying arrays between siblings\n\t\tnewPath := make([]string, len(currentPath))\n\t\tcopy(newPath, currentPath)\n\t\tnewPath = append(newPath, key)\n\n\t\t// Check depth, and just return if depth reached\n\t\tif currentDepth+1 == targetDepth {\n\t\t\t*results = append(*results, newPath)\n\t\t} else {\n\t\t\tchild.collectPaths(currentDepth+1, targetDepth, newPath, results)\n\t\t}\n\t}\n}\n\n// free removes buffers older than the retention threshold from the entire subtree.\n//\n// Recursively frees buffers in this level's metrics and all child levels. Buffers\n// with standard capacity (BufferCap) are returned to the pool. Called by the\n// retention worker to enforce retention policies.\n//\n// Parameters:\n//   - t: Retention threshold timestamp (Unix seconds)\n//\n// Returns:\n//   - int:   Total number of buffers freed in this subtree\n//   - error: Non-nil on failure (propagated from children)\nfunc (l *Level) free(t int64) (int, error) {\n\tl.lock.Lock()\n\tdefer l.lock.Unlock()\n\n\tn := 0\n\tfor i, b := range l.metrics {\n\t\tif b != nil {\n\t\t\tdelme, m := b.free(t)\n\t\t\tn += m\n\t\t\tif delme {\n\t\t\t\tif cap(b.data) != BufferCap {\n\t\t\t\t\tb.data = make([]schema.Float, 0, BufferCap)\n\t\t\t\t}\n\t\t\t\tb.lastUsed = time.Now().Unix()\n\t\t\t\tbufferPool.Put(b)\n\t\t\t\tl.metrics[i] = nil\n\t\t\t}\n\t\t}\n\t}\n\n\tfor _, l := range l.children {\n\t\tm, err := l.free(t)\n\t\tn += m\n\t\tif err != nil {\n\t\t\treturn n, err\n\t\t}\n\t}\n\n\treturn n, nil\n}\n\n// forceFree removes the oldest buffer from each metric chain in the subtree.\n//\n// Unlike free(), which removes based on time threshold, this unconditionally removes\n// the oldest buffer in each chain. Used by MemoryUsageTracker when memory cap is\n// exceeded and time-based retention is insufficient.\n//\n// Recursively processes current level's metrics and all child levels.\n//\n// Returns:\n//   - int:   Total number of buffers freed in this subtree\n//   - error: Non-nil on failure (propagated from children)\nfunc (l *Level) forceFree() (int, error) {\n\tl.lock.Lock()\n\tdefer l.lock.Unlock()\n\n\tn := 0\n\n\t// Iterate over metrics in the current level\n\tfor i, b := range l.metrics {\n\t\tif b != nil {\n\t\t\t// Attempt to free the oldest buffer in this chain\n\t\t\tdelme, freedCount := b.forceFreeOldest()\n\t\t\tn += freedCount\n\n\t\t\t// If delme is true, it means 'b' itself (the head) was the oldest\n\t\t\t// and needs to be removed from the slice.\n\t\t\tif delme {\n\t\t\t\tb.next = nil\n\t\t\t\tb.prev = nil\n\t\t\t\tif cap(b.data) != BufferCap {\n\t\t\t\t\tb.data = make([]schema.Float, 0, BufferCap)\n\t\t\t\t}\n\t\t\t\tb.lastUsed = time.Now().Unix()\n\t\t\t\tbufferPool.Put(b)\n\t\t\t\tl.metrics[i] = nil\n\t\t\t}\n\t\t}\n\t}\n\n\t// Recursively traverse children\n\tfor _, child := range l.children {\n\t\tm, err := child.forceFree()\n\t\tn += m\n\t\tif err != nil {\n\t\t\treturn n, err\n\t\t}\n\t}\n\n\treturn n, nil\n}\n\n// sizeInBytes calculates the total memory usage of all buffers in the subtree.\n//\n// Recursively sums buffer data sizes (count of Float values × sizeof(Float)) across\n// this level's metrics and all child levels. Used by MemoryUsageTracker to enforce\n// memory cap limits.\n//\n// Returns:\n//   - int64: Total bytes used by buffer data in this subtree\nfunc (l *Level) sizeInBytes() int64 {\n\tl.lock.RLock()\n\tdefer l.lock.RUnlock()\n\tsize := int64(0)\n\n\tfor _, b := range l.metrics {\n\t\tif b != nil {\n\t\t\tsize += b.count() * int64(unsafe.Sizeof(schema.Float(0)))\n\t\t}\n\t}\n\n\tfor _, child := range l.children {\n\t\tsize += child.sizeInBytes()\n\t}\n\n\treturn size\n}\n\n// findLevel navigates to the level specified by selector, returning nil if not found.\n//\n// Read-only variant of findLevelOrCreate. Does not create missing levels.\n// Recursively descends the tree following the selector path.\n//\n// Parameters:\n//   - selector: Hierarchical path (e.g., []string{\"emmy\", \"node001\", \"cpu0\"})\n//\n// Returns:\n//   - *Level: The target level, or nil if any component in the path does not exist\nfunc (l *Level) findLevel(selector []string) *Level {\n\tif len(selector) == 0 {\n\t\treturn l\n\t}\n\n\tl.lock.RLock()\n\tdefer l.lock.RUnlock()\n\n\tlvl := l.children[selector[0]]\n\tif lvl == nil {\n\t\treturn nil\n\t}\n\n\treturn lvl.findLevel(selector[1:])\n}\n\n// findBuffers invokes callback on all buffers matching the selector pattern.\n//\n// Supports flexible selector patterns (from cc-lib/util.Selector):\n//   - Exact match: Selector element with String set (e.g., \"node001\")\n//   - Group match: Selector element with Group set (e.g., [\"cpu0\", \"cpu2\", \"cpu4\"])\n//   - Wildcard:    Selector element with Any=true (matches all children)\n//\n// Empty selector (len==0) matches current level's buffer at 'offset' and recursively\n// all descendant buffers at the same offset (used for aggregation queries).\n//\n// Parameters:\n//   - selector: Pattern to match (consumed recursively)\n//   - offset:   Metric index in metrics slice (from MetricConfig.offset)\n//   - f:        Callback invoked on each matching buffer\n//\n// Returns:\n//   - error: First error returned by callback, or nil if all succeeded\n//\n// Example:\n//\n//\t// Find all cpu0 buffers across all hosts:\n//\tfindBuffers([]Selector{{Any: true}, {String: \"cpu0\"}}, metricOffset, callback)\nfunc (l *Level) findBuffers(selector util.Selector, offset int, f func(b *buffer) error) error {\n\tl.lock.RLock()\n\tdefer l.lock.RUnlock()\n\n\tif len(selector) == 0 {\n\t\tb := l.metrics[offset]\n\t\tif b != nil {\n\t\t\treturn f(b)\n\t\t}\n\n\t\tfor _, lvl := range l.children {\n\t\t\terr := lvl.findBuffers(nil, offset, f)\n\t\t\tif err != nil {\n\t\t\t\treturn err\n\t\t\t}\n\t\t}\n\t\treturn nil\n\t}\n\n\tsel := selector[0]\n\tif len(sel.String) != 0 && l.children != nil {\n\t\tlvl, ok := l.children[sel.String]\n\t\tif ok {\n\t\t\terr := lvl.findBuffers(selector[1:], offset, f)\n\t\t\tif err != nil {\n\t\t\t\treturn err\n\t\t\t}\n\t\t}\n\t\treturn nil\n\t}\n\n\tif sel.Group != nil && l.children != nil {\n\t\tfor _, key := range sel.Group {\n\t\t\tlvl, ok := l.children[key]\n\t\t\tif ok {\n\t\t\t\terr := lvl.findBuffers(selector[1:], offset, f)\n\t\t\t\tif err != nil {\n\t\t\t\t\treturn err\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t\treturn nil\n\t}\n\n\tif sel.Any && l.children != nil {\n\t\tfor _, lvl := range l.children {\n\t\t\tif err := lvl.findBuffers(selector[1:], offset, f); err != nil {\n\t\t\t\treturn err\n\t\t\t}\n\t\t}\n\t\treturn nil\n\t}\n\n\treturn nil\n}\n","structuredPatch":[{"oldStart":200,"oldLines":17,"newStart":200,"newLines":33,"lines":["     }","   }"," ","-  for _, l := range l.children {","-    m, err := l.free(t)","+  for key, child := range l.children {","+    m, err := child.free(t)","     n += m","     if err != nil {","       return n, err","     }","+    if child.isEmpty() {","+      delete(l.children, key)","+    }","   }"," ","   return n, nil"," }"," ","+// isEmpty returns true if this level has no metrics and no children.","+func (l *Level) isEmpty() bool {","+  l.lock.RLock()","+  defer l.lock.RUnlock()","+","+  for _, b := range l.metrics {","+    if b != nil {","+      return false","+    }","+  }","+  return len(l.children) == 0","+}","+"," // forceFree removes the oldest buffer from each metric chain in the subtree."," //"," // Unlike free(), which removes based on time threshold, this unconditionally removes"]}],"userModified":false,"replaceAll":false},"sourceToolAssistantUUID":"e7c1f488-8287-43d2-8f41-e704e8d3563b","userType":"external","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"39705f8c-1691-4d60-b0aa-39f588ed9dcf","version":"2.1.74","gitBranch":"hotfix","slug":"linear-roaming-glade"}
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{"parentUuid":"597a6c95-8bc4-4b55-8960-79d4f9581a34","isSidechain":false,"promptId":"a631224c-8362-4377-bee6-9ff6c4b66c68","type":"user","message":{"role":"user","content":[{"tool_use_id":"toolu_018b9ZTo5FhomDhCXaWfySpK","type":"tool_result","content":"The file /Users/jan/prg/ClusterCockpit/cc-backend/pkg/metricstore/level.go has been updated successfully."}]},"uuid":"a57b2a05-b6a2-46cb-aabe-9e36d29d0598","timestamp":"2026-03-13T06:52:22.642Z","toolUseResult":{"filePath":"/Users/jan/prg/ClusterCockpit/cc-backend/pkg/metricstore/level.go","oldString":"func (l *Level) sizeInBytes() int64 {\n\tl.lock.RLock()\n\tdefer l.lock.RUnlock()\n\tsize := int64(0)\n\n\tfor _, b := range l.metrics {\n\t\tif b != nil {\n\t\t\tsize += b.count() * int64(unsafe.Sizeof(schema.Float(0)))\n\t\t}\n\t}\n\n\tfor _, child := range l.children {\n\t\tsize += child.sizeInBytes()\n\t}\n\n\treturn size\n}","newString":"func (l *Level) sizeInBytes() int64 {\n\tl.lock.RLock()\n\tdefer l.lock.RUnlock()\n\tsize := int64(0)\n\n\tfor _, b := range l.metrics {\n\t\tif b != nil {\n\t\t\tsize += b.count() * int64(unsafe.Sizeof(schema.Float(0)))\n\t\t\tsize += b.bufferCount() * int64(unsafe.Sizeof(buffer{}))\n\t\t}\n\t}\n\n\tfor _, child := range l.children {\n\t\tsize += child.sizeInBytes()\n\t}\n\n\treturn size\n}","originalFile":"// Copyright (C) NHR@FAU, University Erlangen-Nuremberg.\n// All rights reserved. This file is part of cc-backend.\n// Use of this source code is governed by a MIT-style\n// license that can be found in the LICENSE file.\n\n// Package metricstore provides level.go: Hierarchical tree structure for metric storage.\n//\n// # Level Architecture\n//\n// The Level type forms a tree structure where each node represents a level in the\n// ClusterCockpit hierarchy: cluster → host → socket → core → hwthread, with special\n// nodes for memory domains and accelerators.\n//\n// Structure:\n//\n//\tRoot Level (cluster=\"emmy\")\n//\t├─ Level (host=\"node001\")\n//\t│  ├─ Level (socket=\"0\")\n//\t│  │  ├─ Level (core=\"0\") [stores cpu0 metrics]\n//\t│  │  └─ Level (core=\"1\") [stores cpu1 metrics]\n//\t│  └─ Level (socket=\"1\")\n//\t│     └─ ...\n//\t└─ Level (host=\"node002\")\n//\t   └─ ...\n//\n// Each Level can:\n//   - Hold data (metrics slice of buffer pointers)\n//   - Have child nodes (children map[string]*Level)\n//   - Both simultaneously (inner nodes can store aggregated metrics)\n//\n// # Selector Paths\n//\n// Selectors are hierarchical paths: []string{\"cluster\", \"host\", \"component\"}.\n// Example: []string{\"emmy\", \"node001\", \"cpu0\"} navigates to the cpu0 core level.\n//\n// # Concurrency\n//\n// RWMutex protects children map and metrics slice. Read-heavy workload (metric reads)\n// uses RLock. Writes (new levels, buffer updates) use Lock. Double-checked locking\n// prevents races during level creation.\npackage metricstore\n\nimport (\n\t\"sync\"\n\t\"time\"\n\t\"unsafe\"\n\n\t\"github.com/ClusterCockpit/cc-lib/v2/schema\"\n\t\"github.com/ClusterCockpit/cc-lib/v2/util\"\n)\n\n// Level represents a node in the hierarchical metric storage tree.\n//\n// Can be both a leaf or inner node. Inner nodes hold data in 'metrics' for aggregated\n// values (e.g., socket-level metrics derived from core-level data). Named \"Level\"\n// instead of \"node\" to avoid confusion with cluster nodes (hosts).\n//\n// Fields:\n//   - children: Map of child level names to Level pointers (e.g., \"cpu0\" → Level)\n//   - metrics:  Slice of buffer pointers (one per metric, indexed by MetricConfig.offset)\n//   - lock:     RWMutex for concurrent access (read-heavy, write-rare)\ntype Level struct {\n\tchildren map[string]*Level\n\tmetrics  []*buffer\n\tlock     sync.RWMutex\n}\n\n// findLevelOrCreate navigates to or creates the level specified by selector.\n//\n// Recursively descends the tree, creating missing levels as needed. Uses double-checked\n// locking: RLock first (fast path), then Lock if creation needed (slow path), then\n// re-check after acquiring Lock to handle races.\n//\n// Example selector: []string{\"emmy\", \"node001\", \"cpu0\"}\n// Navigates: root → emmy → node001 → cpu0, creating levels as needed.\n//\n// Parameters:\n//   - selector: Hierarchical path (consumed recursively, decreasing depth)\n//   - nMetrics: Number of metric slots to allocate in new levels\n//\n// Returns:\n//   - *Level: The target level (existing or newly created)\n//\n// Note: sync.Map may improve performance for high-concurrency writes, but current\n// approach suffices for read-heavy workload.\nfunc (l *Level) findLevelOrCreate(selector []string, nMetrics int) *Level {\n\tif len(selector) == 0 {\n\t\treturn l\n\t}\n\n\t// Allow concurrent reads:\n\tl.lock.RLock()\n\tvar child *Level\n\tvar ok bool\n\tif l.children == nil {\n\t\t// Children map needs to be created...\n\t\tl.lock.RUnlock()\n\t} else {\n\t\tchild, ok = l.children[selector[0]]\n\t\tl.lock.RUnlock()\n\t\tif ok {\n\t\t\treturn child.findLevelOrCreate(selector[1:], nMetrics)\n\t\t}\n\t}\n\n\t// The level does not exist, take write lock for unique access:\n\tl.lock.Lock()\n\t// While this thread waited for the write lock, another thread\n\t// could have created the child node.\n\tif l.children != nil {\n\t\tchild, ok = l.children[selector[0]]\n\t\tif ok {\n\t\t\tl.lock.Unlock()\n\t\t\treturn child.findLevelOrCreate(selector[1:], nMetrics)\n\t\t}\n\t}\n\n\tchild = &Level{\n\t\tmetrics:  make([]*buffer, nMetrics),\n\t\tchildren: nil,\n\t}\n\n\tif l.children != nil {\n\t\tl.children[selector[0]] = child\n\t} else {\n\t\tl.children = map[string]*Level{selector[0]: child}\n\t}\n\tl.lock.Unlock()\n\treturn child.findLevelOrCreate(selector[1:], nMetrics)\n}\n\n// collectPaths gathers all selector paths at the specified depth in the tree.\n//\n// Recursively traverses children, collecting paths when currentDepth+1 == targetDepth.\n// Each path is a selector that can be used with findLevel() or findBuffers().\n//\n// Explicitly copies slices to avoid shared underlying arrays between siblings, preventing\n// unintended mutations.\n//\n// Parameters:\n//   - currentDepth: Depth of current level (0 = root)\n//   - targetDepth:  Depth to collect paths from\n//   - currentPath:  Path accumulated so far\n//   - results:      Output slice (appended to)\n//\n// Example: collectPaths(0, 2, []string{}, &results) collects all 2-level paths\n// like []string{\"emmy\", \"node001\"}, []string{\"emmy\", \"node002\"}, etc.\nfunc (l *Level) collectPaths(currentDepth, targetDepth int, currentPath []string, results *[][]string) {\n\tl.lock.RLock()\n\tdefer l.lock.RUnlock()\n\n\tfor key, child := range l.children {\n\t\tif child == nil {\n\t\t\tcontinue\n\t\t}\n\n\t\t// We explicitly make a new slice and copy data to avoid sharing underlying arrays between siblings\n\t\tnewPath := make([]string, len(currentPath))\n\t\tcopy(newPath, currentPath)\n\t\tnewPath = append(newPath, key)\n\n\t\t// Check depth, and just return if depth reached\n\t\tif currentDepth+1 == targetDepth {\n\t\t\t*results = append(*results, newPath)\n\t\t} else {\n\t\t\tchild.collectPaths(currentDepth+1, targetDepth, newPath, results)\n\t\t}\n\t}\n}\n\n// free removes buffers older than the retention threshold from the entire subtree.\n//\n// Recursively frees buffers in this level's metrics and all child levels. Buffers\n// with standard capacity (BufferCap) are returned to the pool. Called by the\n// retention worker to enforce retention policies.\n//\n// Parameters:\n//   - t: Retention threshold timestamp (Unix seconds)\n//\n// Returns:\n//   - int:   Total number of buffers freed in this subtree\n//   - error: Non-nil on failure (propagated from children)\nfunc (l *Level) free(t int64) (int, error) {\n\tl.lock.Lock()\n\tdefer l.lock.Unlock()\n\n\tn := 0\n\tfor i, b := range l.metrics {\n\t\tif b != nil {\n\t\t\tdelme, m := b.free(t)\n\t\t\tn += m\n\t\t\tif delme {\n\t\t\t\tif cap(b.data) != BufferCap {\n\t\t\t\t\tb.data = make([]schema.Float, 0, BufferCap)\n\t\t\t\t}\n\t\t\t\tb.lastUsed = time.Now().Unix()\n\t\t\t\tbufferPool.Put(b)\n\t\t\t\tl.metrics[i] = nil\n\t\t\t}\n\t\t}\n\t}\n\n\tfor key, child := range l.children {\n\t\tm, err := child.free(t)\n\t\tn += m\n\t\tif err != nil {\n\t\t\treturn n, err\n\t\t}\n\t\tif child.isEmpty() {\n\t\t\tdelete(l.children, key)\n\t\t}\n\t}\n\n\treturn n, nil\n}\n\n// isEmpty returns true if this level has no metrics and no children.\nfunc (l *Level) isEmpty() bool {\n\tl.lock.RLock()\n\tdefer l.lock.RUnlock()\n\n\tfor _, b := range l.metrics {\n\t\tif b != nil {\n\t\t\treturn false\n\t\t}\n\t}\n\treturn len(l.children) == 0\n}\n\n// forceFree removes the oldest buffer from each metric chain in the subtree.\n//\n// Unlike free(), which removes based on time threshold, this unconditionally removes\n// the oldest buffer in each chain. Used by MemoryUsageTracker when memory cap is\n// exceeded and time-based retention is insufficient.\n//\n// Recursively processes current level's metrics and all child levels.\n//\n// Returns:\n//   - int:   Total number of buffers freed in this subtree\n//   - error: Non-nil on failure (propagated from children)\nfunc (l *Level) forceFree() (int, error) {\n\tl.lock.Lock()\n\tdefer l.lock.Unlock()\n\n\tn := 0\n\n\t// Iterate over metrics in the current level\n\tfor i, b := range l.metrics {\n\t\tif b != nil {\n\t\t\t// Attempt to free the oldest buffer in this chain\n\t\t\tdelme, freedCount := b.forceFreeOldest()\n\t\t\tn += freedCount\n\n\t\t\t// If delme is true, it means 'b' itself (the head) was the oldest\n\t\t\t// and needs to be removed from the slice.\n\t\t\tif delme {\n\t\t\t\tb.next = nil\n\t\t\t\tb.prev = nil\n\t\t\t\tif cap(b.data) != BufferCap {\n\t\t\t\t\tb.data = make([]schema.Float, 0, BufferCap)\n\t\t\t\t}\n\t\t\t\tb.lastUsed = time.Now().Unix()\n\t\t\t\tbufferPool.Put(b)\n\t\t\t\tl.metrics[i] = nil\n\t\t\t}\n\t\t}\n\t}\n\n\t// Recursively traverse children\n\tfor _, child := range l.children {\n\t\tm, err := child.forceFree()\n\t\tn += m\n\t\tif err != nil {\n\t\t\treturn n, err\n\t\t}\n\t}\n\n\treturn n, nil\n}\n\n// sizeInBytes calculates the total memory usage of all buffers in the subtree.\n//\n// Recursively sums buffer data sizes (count of Float values × sizeof(Float)) across\n// this level's metrics and all child levels. Used by MemoryUsageTracker to enforce\n// memory cap limits.\n//\n// Returns:\n//   - int64: Total bytes used by buffer data in this subtree\nfunc (l *Level) sizeInBytes() int64 {\n\tl.lock.RLock()\n\tdefer l.lock.RUnlock()\n\tsize := int64(0)\n\n\tfor _, b := range l.metrics {\n\t\tif b != nil {\n\t\t\tsize += b.count() * int64(unsafe.Sizeof(schema.Float(0)))\n\t\t}\n\t}\n\n\tfor _, child := range l.children {\n\t\tsize += child.sizeInBytes()\n\t}\n\n\treturn size\n}\n\n// findLevel navigates to the level specified by selector, returning nil if not found.\n//\n// Read-only variant of findLevelOrCreate. Does not create missing levels.\n// Recursively descends the tree following the selector path.\n//\n// Parameters:\n//   - selector: Hierarchical path (e.g., []string{\"emmy\", \"node001\", \"cpu0\"})\n//\n// Returns:\n//   - *Level: The target level, or nil if any component in the path does not exist\nfunc (l *Level) findLevel(selector []string) *Level {\n\tif len(selector) == 0 {\n\t\treturn l\n\t}\n\n\tl.lock.RLock()\n\tdefer l.lock.RUnlock()\n\n\tlvl := l.children[selector[0]]\n\tif lvl == nil {\n\t\treturn nil\n\t}\n\n\treturn lvl.findLevel(selector[1:])\n}\n\n// findBuffers invokes callback on all buffers matching the selector pattern.\n//\n// Supports flexible selector patterns (from cc-lib/util.Selector):\n//   - Exact match: Selector element with String set (e.g., \"node001\")\n//   - Group match: Selector element with Group set (e.g., [\"cpu0\", \"cpu2\", \"cpu4\"])\n//   - Wildcard:    Selector element with Any=true (matches all children)\n//\n// Empty selector (len==0) matches current level's buffer at 'offset' and recursively\n// all descendant buffers at the same offset (used for aggregation queries).\n//\n// Parameters:\n//   - selector: Pattern to match (consumed recursively)\n//   - offset:   Metric index in metrics slice (from MetricConfig.offset)\n//   - f:        Callback invoked on each matching buffer\n//\n// Returns:\n//   - error: First error returned by callback, or nil if all succeeded\n//\n// Example:\n//\n//\t// Find all cpu0 buffers across all hosts:\n//\tfindBuffers([]Selector{{Any: true}, {String: \"cpu0\"}}, metricOffset, callback)\nfunc (l *Level) findBuffers(selector util.Selector, offset int, f func(b *buffer) error) error {\n\tl.lock.RLock()\n\tdefer l.lock.RUnlock()\n\n\tif len(selector) == 0 {\n\t\tb := l.metrics[offset]\n\t\tif b != nil {\n\t\t\treturn f(b)\n\t\t}\n\n\t\tfor _, lvl := range l.children {\n\t\t\terr := lvl.findBuffers(nil, offset, f)\n\t\t\tif err != nil {\n\t\t\t\treturn err\n\t\t\t}\n\t\t}\n\t\treturn nil\n\t}\n\n\tsel := selector[0]\n\tif len(sel.String) != 0 && l.children != nil {\n\t\tlvl, ok := l.children[sel.String]\n\t\tif ok {\n\t\t\terr := lvl.findBuffers(selector[1:], offset, f)\n\t\t\tif err != nil {\n\t\t\t\treturn err\n\t\t\t}\n\t\t}\n\t\treturn nil\n\t}\n\n\tif sel.Group != nil && l.children != nil {\n\t\tfor _, key := range sel.Group {\n\t\t\tlvl, ok := l.children[key]\n\t\t\tif ok {\n\t\t\t\terr := lvl.findBuffers(selector[1:], offset, f)\n\t\t\t\tif err != nil {\n\t\t\t\t\treturn err\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t\treturn nil\n\t}\n\n\tif sel.Any && l.children != nil {\n\t\tfor _, lvl := range l.children {\n\t\t\tif err := lvl.findBuffers(selector[1:], offset, f); err != nil {\n\t\t\t\treturn err\n\t\t\t}\n\t\t}\n\t\treturn nil\n\t}\n\n\treturn nil\n}\n","structuredPatch":[{"oldStart":294,"oldLines":6,"newStart":294,"newLines":7,"lines":["   for _, b := range l.metrics {","     if b != nil {","       size += b.count() * int64(unsafe.Sizeof(schema.Float(0)))","+      size += b.bufferCount() * int64(unsafe.Sizeof(buffer{}))","     }","   }"," "]}],"userModified":false,"replaceAll":false},"sourceToolAssistantUUID":"597a6c95-8bc4-4b55-8960-79d4f9581a34","userType":"external","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"39705f8c-1691-4d60-b0aa-39f588ed9dcf","version":"2.1.74","gitBranch":"hotfix","slug":"linear-roaming-glade"}
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{"parentUuid":"02ccb42b-fcf2-4694-b9d4-d534825c4f8f","isSidechain":false,"message":{"model":"claude-opus-4-6","id":"msg_01XukQEEktXeTjhSSjzx7Zxx","type":"message","role":"assistant","content":[{"type":"tool_use","id":"toolu_018ashwzcCazMi5NjaQ8jh18","name":"Edit","input":{"replace_all":false,"file_path":"/Users/jan/prg/ClusterCockpit/cc-backend/pkg/metricstore/metricstore.go","old_string":"func MemoryUsageTracker(wg *sync.WaitGroup, ctx context.Context) {\n\tms := GetMemoryStore()\n\n\twg.Go(func() {\n\t\td := DefaultMemoryUsageTrackerInterval\n\n\t\tif d <= 0 {\n\t\t\treturn\n\t\t}\n\n\t\tticker := time.NewTicker(d)\n\t\tdefer ticker.Stop()\n\n\t\tfor {\n\t\t\tselect {\n\t\t\tcase <-ctx.Done():\n\t\t\t\treturn\n\t\t\tcase <-ticker.C:\n\t\t\t\tvar mem runtime.MemStats\n\t\t\t\truntime.ReadMemStats(&mem)\n\t\t\t\tactualMemoryGB := float64(mem.Alloc) / 1e9\n\t\t\t\tmetricDataGB := ms.SizeInGB()\n\t\t\t\tcclog.Infof(\"[METRICSTORE]> memory usage: %.2f GB actual (%.2f GB metric data)\", actualMemoryGB, metricDataGB)\n\n\t\t\t\tfreedExcluded := 0\n\t\t\t\tfreedEmergency := 0\n\t\t\t\tvar err error\n\n\t\t\t\tstate.mu.RLock()\n\t\t\t\tlastRetention := state.lastRetentionTime\n\t\t\t\tselectorsExcluded := state.selectorsExcluded\n\t\t\t\tstate.mu.RUnlock()\n\n\t\t\t\tif lastRetention != 0 && selectorsExcluded {\n\t\t\t\t\tfreedExcluded, err = ms.Free(nil, lastRetention)\n\t\t\t\t\tif err != nil {\n\t\t\t\t\t\tcclog.Errorf(\"[METRICSTORE]> error while force-freeing the excluded buffers: %s\", err)\n\t\t\t\t\t}\n\n\t\t\t\t\tif freedExcluded > 0 {\n\t\t\t\t\t\tdebug.FreeOSMemory()\n\t\t\t\t\t\tcclog.Infof(\"[METRICSTORE]> done: %d excluded buffers force-freed\", freedExcluded)\n\t\t\t\t\t}\n\t\t\t\t}\n\n\t\t\t\truntime.ReadMemStats(&mem)\n\t\t\t\tactualMemoryGB = float64(mem.Alloc) / 1e9\n\n\t\t\t\tbufferPool.Clear()\n\t\t\t\tcclog.Infof(\"[METRICSTORE]> Cleaned up bufferPool\\n\")\n\n\t\t\t\tif actualMemoryGB > float64(Keys.MemoryCap) {\n\t\t\t\t\tcclog.Warnf(\"[METRICSTORE]> memory usage %.2f GB exceeds cap %d GB, starting emergency buffer freeing\", actualMemoryGB, Keys.MemoryCap)\n\n\t\t\t\t\tconst maxIterations = 100\n\n\t\t\t\t\tfor i := range maxIterations {\n\t\t\t\t\t\tif actualMemoryGB < float64(Keys.MemoryCap) {\n\t\t\t\t\t\t\tbreak\n\t\t\t\t\t\t}\n\n\t\t\t\t\t\tfreed, err := ms.ForceFree()\n\t\t\t\t\t\tif err != nil {\n\t\t\t\t\t\t\tcclog.Errorf(\"[METRICSTORE]> error while force-freeing buffers: %s\", err)\n\t\t\t\t\t\t}\n\t\t\t\t\t\tif freed == 0 {\n\t\t\t\t\t\t\tcclog.Errorf(\"[METRICSTORE]> no more buffers to free after %d emergency frees, memory usage %.2f GB still exceeds cap %d GB\", freedEmergency, actualMemoryGB, Keys.MemoryCap)\n\t\t\t\t\t\t\tbreak\n\t\t\t\t\t\t}\n\t\t\t\t\t\tfreedEmergency += freed\n\n\t\t\t\t\t\tif i%10 == 0 && freedEmergency > 0 {\n\t\t\t\t\t\t\truntime.ReadMemStats(&mem)\n\t\t\t\t\t\t\tactualMemoryGB = float64(mem.Alloc) / 1e9\n\t\t\t\t\t\t}\n\t\t\t\t\t}\n\n\t\t\t\t\t// if freedEmergency > 0 {\n\t\t\t\t\t// \tdebug.FreeOSMemory()\n\t\t\t\t\t// }\n\n\t\t\t\t\truntime.ReadMemStats(&mem)\n\t\t\t\t\tactualMemoryGB = float64(mem.Alloc) / 1e9\n\n\t\t\t\t\tif actualMemoryGB >= float64(Keys.MemoryCap) {\n\t\t\t\t\t\tcclog.Errorf(\"[METRICSTORE]> after %d emergency frees, memory usage %.2f GB still at/above cap %d GB\", freedEmergency, actualMemoryGB, Keys.MemoryCap)\n\t\t\t\t\t} else {\n\t\t\t\t\t\tcclog.Infof(\"[METRICSTORE]> emergency freeing complete: %d buffers freed, memory now %.2f GB\", freedEmergency, actualMemoryGB)\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t})\n}","new_string":"func MemoryUsageTracker(wg *sync.WaitGroup, ctx context.Context) {\n\tms := GetMemoryStore()\n\n\twg.Go(func() {\n\t\tnormalInterval := DefaultMemoryUsageTrackerInterval\n\t\tfastInterval := 30 * time.Second\n\n\t\tif normalInterval <= 0 {\n\t\t\treturn\n\t\t}\n\n\t\tticker := time.NewTicker(normalInterval)\n\t\tdefer ticker.Stop()\n\t\tcurrentInterval := normalInterval\n\n\t\tfor {\n\t\t\tselect {\n\t\t\tcase <-ctx.Done():\n\t\t\t\treturn\n\t\t\tcase <-ticker.C:\n\t\t\t\tvar mem runtime.MemStats\n\t\t\t\truntime.ReadMemStats(&mem)\n\t\t\t\tactualMemoryGB := float64(mem.Alloc) / 1e9\n\t\t\t\tmetricDataGB := ms.SizeInGB()\n\t\t\t\tcclog.Infof(\"[METRICSTORE]> memory usage: %.2f GB actual (%.2f GB metric data)\", actualMemoryGB, metricDataGB)\n\n\t\t\t\tfreedExcluded := 0\n\t\t\t\tfreedEmergency := 0\n\t\t\t\tvar err error\n\n\t\t\t\tstate.mu.RLock()\n\t\t\t\tlastRetention := state.lastRetentionTime\n\t\t\t\tselectorsExcluded := state.selectorsExcluded\n\t\t\t\tstate.mu.RUnlock()\n\n\t\t\t\tif lastRetention != 0 && selectorsExcluded {\n\t\t\t\t\tfreedExcluded, err = ms.Free(nil, lastRetention)\n\t\t\t\t\tif err != nil {\n\t\t\t\t\t\tcclog.Errorf(\"[METRICSTORE]> error while force-freeing the excluded buffers: %s\", err)\n\t\t\t\t\t}\n\n\t\t\t\t\tif freedExcluded > 0 {\n\t\t\t\t\t\tdebug.FreeOSMemory()\n\t\t\t\t\t\tcclog.Infof(\"[METRICSTORE]> done: %d excluded buffers force-freed\", freedExcluded)\n\t\t\t\t\t}\n\t\t\t\t}\n\n\t\t\t\truntime.ReadMemStats(&mem)\n\t\t\t\tactualMemoryGB = float64(mem.Alloc) / 1e9\n\n\t\t\t\tif actualMemoryGB > float64(Keys.MemoryCap) {\n\t\t\t\t\tcclog.Warnf(\"[METRICSTORE]> memory usage %.2f GB exceeds cap %d GB, starting emergency buffer freeing\", actualMemoryGB, Keys.MemoryCap)\n\n\t\t\t\t\t// Use progressive time-based Free with increasing threshold\n\t\t\t\t\t// instead of ForceFree loop — fewer tree traversals, more effective\n\t\t\t\t\td, parseErr := time.ParseDuration(Keys.RetentionInMemory)\n\t\t\t\t\tif parseErr != nil {\n\t\t\t\t\t\tcclog.Errorf(\"[METRICSTORE]> cannot parse retention duration: %s\", parseErr)\n\t\t\t\t\t} else {\n\t\t\t\t\t\tthresholds := []float64{0.75, 0.5, 0.25}\n\t\t\t\t\t\tfor _, fraction := range thresholds {\n\t\t\t\t\t\t\tthreshold := time.Now().Add(-time.Duration(float64(d) * fraction))\n\t\t\t\t\t\t\tfreed, freeErr := ms.Free(nil, threshold.Unix())\n\t\t\t\t\t\t\tif freeErr != nil {\n\t\t\t\t\t\t\t\tcclog.Errorf(\"[METRICSTORE]> error while freeing buffers at %.0f%% retention: %s\", fraction*100, freeErr)\n\t\t\t\t\t\t\t}\n\t\t\t\t\t\t\tfreedEmergency += freed\n\n\t\t\t\t\t\t\tbufferPool.Clear()\n\t\t\t\t\t\t\truntime.GC()\n\t\t\t\t\t\t\truntime.ReadMemStats(&mem)\n\t\t\t\t\t\t\tactualMemoryGB = float64(mem.Alloc) / 1e9\n\n\t\t\t\t\t\t\tif actualMemoryGB < float64(Keys.MemoryCap) {\n\t\t\t\t\t\t\t\tbreak\n\t\t\t\t\t\t\t}\n\t\t\t\t\t\t}\n\t\t\t\t\t}\n\n\t\t\t\t\tbufferPool.Clear()\n\t\t\t\t\tdebug.FreeOSMemory()\n\n\t\t\t\t\truntime.ReadMemStats(&mem)\n\t\t\t\t\tactualMemoryGB = float64(mem.Alloc) / 1e9\n\n\t\t\t\t\tif actualMemoryGB >= float64(Keys.MemoryCap) {\n\t\t\t\t\t\tcclog.Errorf(\"[METRICSTORE]> after emergency frees (%d buffers), memory usage %.2f GB still at/above cap %d GB\", freedEmergency, actualMemoryGB, Keys.MemoryCap)\n\t\t\t\t\t} else {\n\t\t\t\t\t\tcclog.Infof(\"[METRICSTORE]> emergency freeing complete: %d buffers freed, memory now %.2f GB\", freedEmergency, actualMemoryGB)\n\t\t\t\t\t}\n\t\t\t\t}\n\n\t\t\t\t// Adaptive ticker: check more frequently when memory is high\n\t\t\t\tmemoryRatio := actualMemoryGB / float64(Keys.MemoryCap)\n\t\t\t\tif memoryRatio > 0.8 && currentInterval != fastInterval {\n\t\t\t\t\tticker.Reset(fastInterval)\n\t\t\t\t\tcurrentInterval = fastInterval\n\t\t\t\t\tcclog.Infof(\"[METRICSTORE]> memory at %.0f%% of cap, switching to fast check interval (30s)\", memoryRatio*100)\n\t\t\t\t} else if memoryRatio <= 0.8 && currentInterval != normalInterval {\n\t\t\t\t\tticker.Reset(normalInterval)\n\t\t\t\t\tcurrentInterval = normalInterval\n\t\t\t\t\tcclog.Infof(\"[METRICSTORE]> memory at %.0f%% of cap, switching to normal check interval\", memoryRatio*100)\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t})\n}"},"caller":{"type":"direct"}}],"stop_reason":"tool_use","stop_sequence":null,"usage":{"input_tokens":1,"cache_creation_input_tokens":460,"cache_read_input_tokens":50728,"output_tokens":2392,"server_tool_use":{"web_search_requests":0,"web_fetch_requests":0},"service_tier":"standard","cache_creation":{"ephemeral_1h_input_tokens":460,"ephemeral_5m_input_tokens":0},"inference_geo":"","iterations":[],"speed":"standard"}},"requestId":"req_011CYzdw4KBHE4qmGNhsGS6K","type":"assistant","uuid":"3c8c66e9-ca84-40e2-9bfa-47a3a0f938e3","timestamp":"2026-03-13T06:52:51.536Z","userType":"external","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"39705f8c-1691-4d60-b0aa-39f588ed9dcf","version":"2.1.74","gitBranch":"hotfix","slug":"linear-roaming-glade"}
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{"parentUuid":"3c8c66e9-ca84-40e2-9bfa-47a3a0f938e3","isSidechain":false,"promptId":"a631224c-8362-4377-bee6-9ff6c4b66c68","type":"user","message":{"role":"user","content":[{"tool_use_id":"toolu_018ashwzcCazMi5NjaQ8jh18","type":"tool_result","content":"The file /Users/jan/prg/ClusterCockpit/cc-backend/pkg/metricstore/metricstore.go has been updated successfully."}]},"uuid":"143d0d76-bbb7-4d40-99a7-2948e69c0a5f","timestamp":"2026-03-13T06:52:51.567Z","toolUseResult":{"filePath":"/Users/jan/prg/ClusterCockpit/cc-backend/pkg/metricstore/metricstore.go","oldString":"func MemoryUsageTracker(wg *sync.WaitGroup, ctx context.Context) {\n\tms := GetMemoryStore()\n\n\twg.Go(func() {\n\t\td := DefaultMemoryUsageTrackerInterval\n\n\t\tif d <= 0 {\n\t\t\treturn\n\t\t}\n\n\t\tticker := time.NewTicker(d)\n\t\tdefer ticker.Stop()\n\n\t\tfor {\n\t\t\tselect {\n\t\t\tcase <-ctx.Done():\n\t\t\t\treturn\n\t\t\tcase <-ticker.C:\n\t\t\t\tvar mem runtime.MemStats\n\t\t\t\truntime.ReadMemStats(&mem)\n\t\t\t\tactualMemoryGB := float64(mem.Alloc) / 1e9\n\t\t\t\tmetricDataGB := ms.SizeInGB()\n\t\t\t\tcclog.Infof(\"[METRICSTORE]> memory usage: %.2f GB actual (%.2f GB metric data)\", actualMemoryGB, metricDataGB)\n\n\t\t\t\tfreedExcluded := 0\n\t\t\t\tfreedEmergency := 0\n\t\t\t\tvar err error\n\n\t\t\t\tstate.mu.RLock()\n\t\t\t\tlastRetention := state.lastRetentionTime\n\t\t\t\tselectorsExcluded := state.selectorsExcluded\n\t\t\t\tstate.mu.RUnlock()\n\n\t\t\t\tif lastRetention != 0 && selectorsExcluded {\n\t\t\t\t\tfreedExcluded, err = ms.Free(nil, lastRetention)\n\t\t\t\t\tif err != nil {\n\t\t\t\t\t\tcclog.Errorf(\"[METRICSTORE]> error while force-freeing the excluded buffers: %s\", err)\n\t\t\t\t\t}\n\n\t\t\t\t\tif freedExcluded > 0 {\n\t\t\t\t\t\tdebug.FreeOSMemory()\n\t\t\t\t\t\tcclog.Infof(\"[METRICSTORE]> done: %d excluded buffers force-freed\", freedExcluded)\n\t\t\t\t\t}\n\t\t\t\t}\n\n\t\t\t\truntime.ReadMemStats(&mem)\n\t\t\t\tactualMemoryGB = float64(mem.Alloc) / 1e9\n\n\t\t\t\tbufferPool.Clear()\n\t\t\t\tcclog.Infof(\"[METRICSTORE]> Cleaned up bufferPool\\n\")\n\n\t\t\t\tif actualMemoryGB > float64(Keys.MemoryCap) {\n\t\t\t\t\tcclog.Warnf(\"[METRICSTORE]> memory usage %.2f GB exceeds cap %d GB, starting emergency buffer freeing\", actualMemoryGB, Keys.MemoryCap)\n\n\t\t\t\t\tconst maxIterations = 100\n\n\t\t\t\t\tfor i := range maxIterations {\n\t\t\t\t\t\tif actualMemoryGB < float64(Keys.MemoryCap) {\n\t\t\t\t\t\t\tbreak\n\t\t\t\t\t\t}\n\n\t\t\t\t\t\tfreed, err := ms.ForceFree()\n\t\t\t\t\t\tif err != nil {\n\t\t\t\t\t\t\tcclog.Errorf(\"[METRICSTORE]> error while force-freeing buffers: %s\", err)\n\t\t\t\t\t\t}\n\t\t\t\t\t\tif freed == 0 {\n\t\t\t\t\t\t\tcclog.Errorf(\"[METRICSTORE]> no more buffers to free after %d emergency frees, memory usage %.2f GB still exceeds cap %d GB\", freedEmergency, actualMemoryGB, Keys.MemoryCap)\n\t\t\t\t\t\t\tbreak\n\t\t\t\t\t\t}\n\t\t\t\t\t\tfreedEmergency += freed\n\n\t\t\t\t\t\tif i%10 == 0 && freedEmergency > 0 {\n\t\t\t\t\t\t\truntime.ReadMemStats(&mem)\n\t\t\t\t\t\t\tactualMemoryGB = float64(mem.Alloc) / 1e9\n\t\t\t\t\t\t}\n\t\t\t\t\t}\n\n\t\t\t\t\t// if freedEmergency > 0 {\n\t\t\t\t\t// \tdebug.FreeOSMemory()\n\t\t\t\t\t// }\n\n\t\t\t\t\truntime.ReadMemStats(&mem)\n\t\t\t\t\tactualMemoryGB = float64(mem.Alloc) / 1e9\n\n\t\t\t\t\tif actualMemoryGB >= float64(Keys.MemoryCap) {\n\t\t\t\t\t\tcclog.Errorf(\"[METRICSTORE]> after %d emergency frees, memory usage %.2f GB still at/above cap %d GB\", freedEmergency, actualMemoryGB, Keys.MemoryCap)\n\t\t\t\t\t} else {\n\t\t\t\t\t\tcclog.Infof(\"[METRICSTORE]> emergency freeing complete: %d buffers freed, memory now %.2f GB\", freedEmergency, actualMemoryGB)\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t})\n}","newString":"func MemoryUsageTracker(wg *sync.WaitGroup, ctx context.Context) {\n\tms := GetMemoryStore()\n\n\twg.Go(func() {\n\t\tnormalInterval := DefaultMemoryUsageTrackerInterval\n\t\tfastInterval := 30 * time.Second\n\n\t\tif normalInterval <= 0 {\n\t\t\treturn\n\t\t}\n\n\t\tticker := time.NewTicker(normalInterval)\n\t\tdefer ticker.Stop()\n\t\tcurrentInterval := normalInterval\n\n\t\tfor {\n\t\t\tselect {\n\t\t\tcase <-ctx.Done():\n\t\t\t\treturn\n\t\t\tcase <-ticker.C:\n\t\t\t\tvar mem runtime.MemStats\n\t\t\t\truntime.ReadMemStats(&mem)\n\t\t\t\tactualMemoryGB := float64(mem.Alloc) / 1e9\n\t\t\t\tmetricDataGB := ms.SizeInGB()\n\t\t\t\tcclog.Infof(\"[METRICSTORE]> memory usage: %.2f GB actual (%.2f GB metric data)\", actualMemoryGB, metricDataGB)\n\n\t\t\t\tfreedExcluded := 0\n\t\t\t\tfreedEmergency := 0\n\t\t\t\tvar err error\n\n\t\t\t\tstate.mu.RLock()\n\t\t\t\tlastRetention := state.lastRetentionTime\n\t\t\t\tselectorsExcluded := state.selectorsExcluded\n\t\t\t\tstate.mu.RUnlock()\n\n\t\t\t\tif lastRetention != 0 && selectorsExcluded {\n\t\t\t\t\tfreedExcluded, err = ms.Free(nil, lastRetention)\n\t\t\t\t\tif err != nil {\n\t\t\t\t\t\tcclog.Errorf(\"[METRICSTORE]> error while force-freeing the excluded buffers: %s\", err)\n\t\t\t\t\t}\n\n\t\t\t\t\tif freedExcluded > 0 {\n\t\t\t\t\t\tdebug.FreeOSMemory()\n\t\t\t\t\t\tcclog.Infof(\"[METRICSTORE]> done: %d excluded buffers force-freed\", freedExcluded)\n\t\t\t\t\t}\n\t\t\t\t}\n\n\t\t\t\truntime.ReadMemStats(&mem)\n\t\t\t\tactualMemoryGB = float64(mem.Alloc) / 1e9\n\n\t\t\t\tif actualMemoryGB > float64(Keys.MemoryCap) {\n\t\t\t\t\tcclog.Warnf(\"[METRICSTORE]> memory usage %.2f GB exceeds cap %d GB, starting emergency buffer freeing\", actualMemoryGB, Keys.MemoryCap)\n\n\t\t\t\t\t// Use progressive time-based Free with increasing threshold\n\t\t\t\t\t// instead of ForceFree loop — fewer tree traversals, more effective\n\t\t\t\t\td, parseErr := time.ParseDuration(Keys.RetentionInMemory)\n\t\t\t\t\tif parseErr != nil {\n\t\t\t\t\t\tcclog.Errorf(\"[METRICSTORE]> cannot parse retention duration: %s\", parseErr)\n\t\t\t\t\t} else {\n\t\t\t\t\t\tthresholds := []float64{0.75, 0.5, 0.25}\n\t\t\t\t\t\tfor _, fraction := range thresholds {\n\t\t\t\t\t\t\tthreshold := time.Now().Add(-time.Duration(float64(d) * fraction))\n\t\t\t\t\t\t\tfreed, freeErr := ms.Free(nil, threshold.Unix())\n\t\t\t\t\t\t\tif freeErr != nil {\n\t\t\t\t\t\t\t\tcclog.Errorf(\"[METRICSTORE]> error while freeing buffers at %.0f%% retention: %s\", fraction*100, freeErr)\n\t\t\t\t\t\t\t}\n\t\t\t\t\t\t\tfreedEmergency += freed\n\n\t\t\t\t\t\t\tbufferPool.Clear()\n\t\t\t\t\t\t\truntime.GC()\n\t\t\t\t\t\t\truntime.ReadMemStats(&mem)\n\t\t\t\t\t\t\tactualMemoryGB = float64(mem.Alloc) / 1e9\n\n\t\t\t\t\t\t\tif actualMemoryGB < float64(Keys.MemoryCap) {\n\t\t\t\t\t\t\t\tbreak\n\t\t\t\t\t\t\t}\n\t\t\t\t\t\t}\n\t\t\t\t\t}\n\n\t\t\t\t\tbufferPool.Clear()\n\t\t\t\t\tdebug.FreeOSMemory()\n\n\t\t\t\t\truntime.ReadMemStats(&mem)\n\t\t\t\t\tactualMemoryGB = float64(mem.Alloc) / 1e9\n\n\t\t\t\t\tif actualMemoryGB >= float64(Keys.MemoryCap) {\n\t\t\t\t\t\tcclog.Errorf(\"[METRICSTORE]> after emergency frees (%d buffers), memory usage %.2f GB still at/above cap %d GB\", freedEmergency, actualMemoryGB, Keys.MemoryCap)\n\t\t\t\t\t} else {\n\t\t\t\t\t\tcclog.Infof(\"[METRICSTORE]> emergency freeing complete: %d buffers freed, memory now %.2f GB\", freedEmergency, actualMemoryGB)\n\t\t\t\t\t}\n\t\t\t\t}\n\n\t\t\t\t// Adaptive ticker: check more frequently when memory is high\n\t\t\t\tmemoryRatio := actualMemoryGB / float64(Keys.MemoryCap)\n\t\t\t\tif memoryRatio > 0.8 && currentInterval != fastInterval {\n\t\t\t\t\tticker.Reset(fastInterval)\n\t\t\t\t\tcurrentInterval = fastInterval\n\t\t\t\t\tcclog.Infof(\"[METRICSTORE]> memory at %.0f%% of cap, switching to fast check interval (30s)\", memoryRatio*100)\n\t\t\t\t} else if memoryRatio <= 0.8 && currentInterval != normalInterval {\n\t\t\t\t\tticker.Reset(normalInterval)\n\t\t\t\t\tcurrentInterval = normalInterval\n\t\t\t\t\tcclog.Infof(\"[METRICSTORE]> memory at %.0f%% of cap, switching to normal check interval\", memoryRatio*100)\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t})\n}","originalFile":"// Copyright (C) NHR@FAU, University Erlangen-Nuremberg.\n// All rights reserved. This file is part of cc-backend.\n// Use of this source code is governed by a MIT-style\n// license that can be found in the LICENSE file.\n\n// Package metricstore provides an efficient in-memory time-series metric storage system\n// with support for hierarchical data organization, checkpointing, and archiving.\n//\n// The package organizes metrics in a tree structure (cluster → host → component) and\n// provides concurrent read/write access to metric data with configurable aggregation strategies.\n// Background goroutines handle periodic checkpointing (JSON or Avro format), archiving old data,\n// and enforcing retention policies.\n//\n// Key features:\n//   - In-memory metric storage with configurable retention\n//   - Hierarchical data organization (selectors)\n//   - Concurrent checkpoint/archive workers\n//   - Support for sum and average aggregation\n//   - NATS integration for metric ingestion\npackage metricstore\n\nimport (\n\t\"bytes\"\n\t\"context\"\n\t\"encoding/json\"\n\t\"errors\"\n\t\"fmt\"\n\t\"runtime\"\n\t\"runtime/debug\"\n\t\"slices\"\n\t\"sync\"\n\t\"time\"\n\n\t\"github.com/ClusterCockpit/cc-backend/internal/config\"\n\tcclog \"github.com/ClusterCockpit/cc-lib/v2/ccLogger\"\n\t\"github.com/ClusterCockpit/cc-lib/v2/resampler\"\n\t\"github.com/ClusterCockpit/cc-lib/v2/schema\"\n\t\"github.com/ClusterCockpit/cc-lib/v2/util\"\n)\n\n// GlobalState holds the global state for the metric store with thread-safe access.\ntype GlobalState struct {\n\tmu                sync.RWMutex\n\tlastRetentionTime int64\n\tselectorsExcluded bool\n}\n\nvar (\n\tsingleton  sync.Once\n\tmsInstance *MemoryStore\n\t// shutdownFunc stores the context cancellation function created in Init\n\t// and is called during Shutdown to cancel all background goroutines\n\tshutdownFunc   context.CancelFunc\n\tshutdownFuncMu sync.Mutex // Protects shutdownFunc from concurrent access\n\t// Create a global instance\n\tstate = &GlobalState{}\n)\n\n// NodeProvider provides information about nodes currently in use by running jobs.\n//\n// This interface allows metricstore to query job information without directly\n// depending on the repository package, breaking the import cycle.\n//\n// Implementations should return nodes that are actively processing jobs started\n// before the given timestamp. These nodes will be excluded from retention-based\n// garbage collection to prevent data loss for jobs that are still running or\n// recently completed.\ntype NodeProvider interface {\n\t// GetUsedNodes returns a map of cluster names to sorted lists of unique hostnames\n\t// that are currently in use by jobs that started before the given timestamp.\n\t//\n\t// Parameters:\n\t//   - ts: Unix timestamp threshold - returns nodes with jobs started before this time\n\t//\n\t// Returns:\n\t//   - Map of cluster names to lists of node hostnames that should be excluded from garbage collection\n\t//   - Error if the query fails\n\tGetUsedNodes(ts int64) (map[string][]string, error)\n}\n\n// Metric represents a single metric data point to be written to the store.\ntype Metric struct {\n\tName  string\n\tValue schema.Float\n\t// MetricConfig contains frequency and aggregation settings for this metric.\n\t// If Frequency is 0, configuration will be looked up from MemoryStore.Metrics during Write().\n\tMetricConfig MetricConfig\n}\n\n// MemoryStore is the main in-memory time-series metric storage implementation.\n//\n// It organizes metrics in a hierarchical tree structure where each level represents\n// a component of the system hierarchy (e.g., cluster → host → CPU). Each level can\n// store multiple metrics as time-series buffers.\n//\n// The store is initialized as a singleton via InitMetrics() and accessed via GetMemoryStore().\n// All public methods are safe for concurrent use.\ntype MemoryStore struct {\n\tMetrics      map[string]MetricConfig\n\troot         Level\n\tnodeProvider NodeProvider\n}\n\n// Init initializes the metric store from configuration and starts background workers.\n//\n// This function must be called exactly once before any other metricstore operations.\n// It performs the following initialization steps:\n//  1. Validates and decodes the metric store configuration\n//  2. Configures worker pool size (defaults to NumCPU/2+1, max 10)\n//  3. Loads metric configurations from all registered clusters\n//  4. Restores checkpoints within the retention window\n//  5. Starts background workers for retention, checkpointing, archiving, and monitoring\n//  6. Optionally subscribes to NATS for real-time metric ingestion\n//\n// Parameters:\n//   - rawConfig: JSON configuration for the metric store (see MetricStoreConfig)\n//   - wg: WaitGroup that will be incremented for each background goroutine started\n//\n// The function will call cclog.Fatal on critical errors during initialization.\n// Use Shutdown() to cleanly stop all background workers started by Init().\n//\n// Note: Signal handling must be implemented by the caller. Call Shutdown() when\n// receiving termination signals to ensure checkpoint data is persisted.\nfunc Init(rawConfig json.RawMessage, metrics map[string]MetricConfig, wg *sync.WaitGroup) {\n\tstartupTime := time.Now()\n\n\tif rawConfig != nil {\n\t\tconfig.Validate(configSchema, rawConfig)\n\t\tdec := json.NewDecoder(bytes.NewReader(rawConfig))\n\t\tdec.DisallowUnknownFields()\n\t\tif err := dec.Decode(&Keys); err != nil {\n\t\t\tcclog.Abortf(\"[METRICSTORE]> Metric Store Config Init: Could not decode config file '%s'.\\nError: %s\\n\", rawConfig, err.Error())\n\t\t}\n\t}\n\n\t// Set NumWorkers from config or use default\n\tif Keys.NumWorkers <= 0 {\n\t\tKeys.NumWorkers = min(runtime.NumCPU()/2+1, DefaultMaxWorkers)\n\t}\n\tcclog.Debugf(\"[METRICSTORE]> Using %d workers for checkpoint/archive operations\\n\", Keys.NumWorkers)\n\n\t// Pass the config.MetricStoreKeys\n\tInitMetrics(metrics)\n\n\tms := GetMemoryStore()\n\n\td, err := time.ParseDuration(Keys.RetentionInMemory)\n\tif err != nil {\n\t\tcclog.Fatal(err)\n\t}\n\n\trestoreFrom := startupTime.Add(-d)\n\tcclog.Infof(\"[METRICSTORE]> Loading checkpoints newer than %s\\n\", restoreFrom.Format(time.RFC3339))\n\tfiles, err := ms.FromCheckpointFiles(Keys.Checkpoints.RootDir, restoreFrom.Unix())\n\tloadedData := ms.SizeInBytes() / 1024 / 1024 // In MB\n\tif err != nil {\n\t\tcclog.Fatalf(\"[METRICSTORE]> Loading checkpoints failed: %s\\n\", err.Error())\n\t} else {\n\t\tcclog.Infof(\"[METRICSTORE]> Checkpoints loaded (%d files, %d MB, that took %fs)\\n\", files, loadedData, time.Since(startupTime).Seconds())\n\t}\n\n\t// Try to use less memory by forcing a GC run here and then\n\t// lowering the target percentage. The default of 100 means\n\t// that only once the ratio of new allocations execeds the\n\t// previously active heap, a GC is triggered.\n\t// Forcing a GC here will set the \"previously active heap\"\n\t// to a minumum.\n\t// runtime.GC()\n\n\tctx, shutdown := context.WithCancel(context.Background())\n\n\tRetention(wg, ctx)\n\tCheckpointing(wg, ctx)\n\tCleanUp(wg, ctx)\n\tWALStaging(wg, ctx)\n\tMemoryUsageTracker(wg, ctx)\n\n\t// Note: Signal handling has been removed from this function.\n\t// The caller is responsible for handling shutdown signals and calling\n\t// the shutdown() function when appropriate.\n\t// Store the shutdown function for later use by Shutdown()\n\tshutdownFuncMu.Lock()\n\tshutdownFunc = shutdown\n\tshutdownFuncMu.Unlock()\n\n\tif Keys.Subscriptions != nil {\n\t\terr = ReceiveNats(ms, 1, ctx)\n\t\tif err != nil {\n\t\t\tcclog.Fatal(err)\n\t\t}\n\t}\n}\n\n// InitMetrics initializes the singleton MemoryStore instance with the given metric configurations.\n//\n// This function must be called before GetMemoryStore() and can only be called once due to\n// the singleton pattern. It assigns each metric an internal offset for efficient buffer indexing.\n//\n// Parameters:\n//   - metrics: Map of metric names to their configurations (frequency and aggregation strategy)\n//\n// Panics if any metric has Frequency == 0, which indicates an invalid configuration.\n//\n// After this call, the global msInstance is ready for use via GetMemoryStore().\nfunc InitMetrics(metrics map[string]MetricConfig) {\n\tsingleton.Do(func() {\n\t\toffset := 0\n\t\tfor key, cfg := range metrics {\n\t\t\tif cfg.Frequency == 0 {\n\t\t\t\tpanic(\"[METRICSTORE]> invalid frequency\")\n\t\t\t}\n\n\t\t\tmetrics[key] = MetricConfig{\n\t\t\t\tFrequency:   cfg.Frequency,\n\t\t\t\tAggregation: cfg.Aggregation,\n\t\t\t\toffset:      offset,\n\t\t\t}\n\t\t\toffset += 1\n\t\t}\n\n\t\tmsInstance = &MemoryStore{\n\t\t\troot: Level{\n\t\t\t\tmetrics:  make([]*buffer, len(metrics)),\n\t\t\t\tchildren: make(map[string]*Level),\n\t\t\t},\n\t\t\tMetrics: metrics,\n\t\t}\n\t})\n}\n\n// GetMemoryStore returns the singleton MemoryStore instance.\n//\n// Returns the initialized MemoryStore singleton. Calls cclog.Fatal if InitMetrics() was not called first.\n//\n// This function is safe for concurrent use after initialization.\nfunc GetMemoryStore() *MemoryStore {\n\tif msInstance == nil {\n\t\tcclog.Warnf(\"[METRICSTORE]> MemoryStore not initialized!\")\n\t}\n\n\treturn msInstance\n}\n\nfunc (ms *MemoryStore) GetMetricFrequency(metricName string) (int64, error) {\n\tif metric, ok := ms.Metrics[metricName]; ok {\n\t\treturn metric.Frequency, nil\n\t}\n\treturn 0, fmt.Errorf(\"[METRICSTORE]> metric %s not found\", metricName)\n}\n\n// SetNodeProvider sets the NodeProvider implementation for the MemoryStore.\n// This must be called during initialization to provide job state information\n// for selective buffer retention during Free operations.\n// If not set, the Free function will fall back to freeing all buffers.\nfunc (ms *MemoryStore) SetNodeProvider(provider NodeProvider) {\n\tms.nodeProvider = provider\n}\n\n// Shutdown performs a graceful shutdown of the metric store.\n//\n// This function cancels all background goroutines started by Init() and writes\n// a final checkpoint to disk before returning. It should be called when the\n// application receives a termination signal.\n//\n// The function will:\n//  1. Cancel the context to stop all background workers\n//  2. Close the WAL messages channel if using WAL format\n//  3. Write a final checkpoint to preserve in-memory data\n//  4. Log any errors encountered during shutdown\n//\n// Note: This function blocks until the final checkpoint is written.\nfunc Shutdown() {\n\tshutdownFuncMu.Lock()\n\tdefer shutdownFuncMu.Unlock()\n\tif shutdownFunc != nil {\n\t\tshutdownFunc()\n\t}\n\n\tif Keys.Checkpoints.FileFormat == \"wal\" {\n\t\tclose(WALMessages)\n\t}\n\n\tcclog.Infof(\"[METRICSTORE]> Writing to '%s'...\\n\", Keys.Checkpoints.RootDir)\n\tvar files int\n\tvar err error\n\n\tms := GetMemoryStore()\n\n\tlastCheckpointMu.Lock()\n\tfrom := lastCheckpoint\n\tlastCheckpointMu.Unlock()\n\n\tif Keys.Checkpoints.FileFormat == \"wal\" {\n\t\tvar hostDirs []string\n\t\tfiles, hostDirs, err = ms.ToCheckpointWAL(Keys.Checkpoints.RootDir, from.Unix(), time.Now().Unix())\n\t\tif err == nil {\n\t\t\tRotateWALFilesAfterShutdown(hostDirs)\n\t\t}\n\t} else {\n\t\tfiles, err = ms.ToCheckpoint(Keys.Checkpoints.RootDir, from.Unix(), time.Now().Unix())\n\t}\n\n\tif err != nil {\n\t\tcclog.Errorf(\"[METRICSTORE]> Writing checkpoint failed: %s\\n\", err.Error())\n\t}\n\tcclog.Infof(\"[METRICSTORE]> Done! (%d files written)\\n\", files)\n}\n\n// Retention starts a background goroutine that periodically frees old metric data.\n//\n// This worker runs at half the retention interval and calls Free() to remove buffers\n// older than the configured retention time. It respects the NodeProvider to preserve\n// data for nodes with active jobs.\n//\n// Parameters:\n//   - wg: WaitGroup to signal completion when context is cancelled\n//   - ctx: Context for cancellation signal\n//\n// The goroutine exits when ctx is cancelled.\nfunc Retention(wg *sync.WaitGroup, ctx context.Context) {\n\tms := GetMemoryStore()\n\n\twg.Go(func() {\n\t\td, err := time.ParseDuration(Keys.RetentionInMemory)\n\t\tif err != nil {\n\t\t\tcclog.Fatal(err)\n\t\t}\n\t\tif d <= 0 {\n\t\t\treturn\n\t\t}\n\n\t\ttickInterval := d / 2\n\t\tif tickInterval <= 0 {\n\t\t\treturn\n\t\t}\n\t\tticker := time.NewTicker(tickInterval)\n\t\tdefer ticker.Stop()\n\n\t\tfor {\n\t\t\tselect {\n\t\t\tcase <-ctx.Done():\n\t\t\t\treturn\n\t\t\tcase <-ticker.C:\n\t\t\t\tstate.mu.Lock()\n\n\t\t\t\tt := time.Now().Add(-d)\n\n\t\t\t\tstate.lastRetentionTime = t.Unix()\n\n\t\t\t\tcclog.Infof(\"[METRICSTORE]> start freeing buffers (older than %s)...\\n\", t.Format(time.RFC3339))\n\n\t\t\t\tfreed, err := Free(ms, t)\n\t\t\t\tif err != nil {\n\t\t\t\t\tcclog.Errorf(\"[METRICSTORE]> freeing up buffers failed: %s\\n\", err.Error())\n\t\t\t\t} else {\n\t\t\t\t\tcclog.Infof(\"[METRICSTORE]> done: %d buffers freed\\n\", freed)\n\t\t\t\t}\n\n\t\t\t\tstate.mu.Unlock()\n\n\t\t\t\t// Clean up the buffer pool\n\t\t\t\tbufferPool.Clean(state.lastRetentionTime)\n\t\t\t}\n\t\t}\n\t})\n}\n\n// MemoryUsageTracker starts a background goroutine that monitors memory usage.\n//\n// This worker checks actual process memory usage (via runtime.MemStats) periodically\n// and force-frees buffers if memory exceeds the configured cap. It uses FreeOSMemory()\n// to return memory to the OS after freeing buffers, avoiding aggressive GC that causes\n// performance issues.\n//\n// The tracker logs both actual memory usage (heap allocated) and metric data size for\n// visibility into memory overhead from Go runtime structures and allocations.\n//\n// Parameters:\n//   - wg: WaitGroup to signal completion when context is cancelled\n//   - ctx: Context for cancellation signal\n//\n// The goroutine exits when ctx is cancelled.\nfunc MemoryUsageTracker(wg *sync.WaitGroup, ctx context.Context) {\n\tms := GetMemoryStore()\n\n\twg.Go(func() {\n\t\td := DefaultMemoryUsageTrackerInterval\n\n\t\tif d <= 0 {\n\t\t\treturn\n\t\t}\n\n\t\tticker := time.NewTicker(d)\n\t\tdefer ticker.Stop()\n\n\t\tfor {\n\t\t\tselect {\n\t\t\tcase <-ctx.Done():\n\t\t\t\treturn\n\t\t\tcase <-ticker.C:\n\t\t\t\tvar mem runtime.MemStats\n\t\t\t\truntime.ReadMemStats(&mem)\n\t\t\t\tactualMemoryGB := float64(mem.Alloc) / 1e9\n\t\t\t\tmetricDataGB := ms.SizeInGB()\n\t\t\t\tcclog.Infof(\"[METRICSTORE]> memory usage: %.2f GB actual (%.2f GB metric data)\", actualMemoryGB, metricDataGB)\n\n\t\t\t\tfreedExcluded := 0\n\t\t\t\tfreedEmergency := 0\n\t\t\t\tvar err error\n\n\t\t\t\tstate.mu.RLock()\n\t\t\t\tlastRetention := state.lastRetentionTime\n\t\t\t\tselectorsExcluded := state.selectorsExcluded\n\t\t\t\tstate.mu.RUnlock()\n\n\t\t\t\tif lastRetention != 0 && selectorsExcluded {\n\t\t\t\t\tfreedExcluded, err = ms.Free(nil, lastRetention)\n\t\t\t\t\tif err != nil {\n\t\t\t\t\t\tcclog.Errorf(\"[METRICSTORE]> error while force-freeing the excluded buffers: %s\", err)\n\t\t\t\t\t}\n\n\t\t\t\t\tif freedExcluded > 0 {\n\t\t\t\t\t\tdebug.FreeOSMemory()\n\t\t\t\t\t\tcclog.Infof(\"[METRICSTORE]> done: %d excluded buffers force-freed\", freedExcluded)\n\t\t\t\t\t}\n\t\t\t\t}\n\n\t\t\t\truntime.ReadMemStats(&mem)\n\t\t\t\tactualMemoryGB = float64(mem.Alloc) / 1e9\n\n\t\t\t\tbufferPool.Clear()\n\t\t\t\tcclog.Infof(\"[METRICSTORE]> Cleaned up bufferPool\\n\")\n\n\t\t\t\tif actualMemoryGB > float64(Keys.MemoryCap) {\n\t\t\t\t\tcclog.Warnf(\"[METRICSTORE]> memory usage %.2f GB exceeds cap %d GB, starting emergency buffer freeing\", actualMemoryGB, Keys.MemoryCap)\n\n\t\t\t\t\tconst maxIterations = 100\n\n\t\t\t\t\tfor i := range maxIterations {\n\t\t\t\t\t\tif actualMemoryGB < float64(Keys.MemoryCap) {\n\t\t\t\t\t\t\tbreak\n\t\t\t\t\t\t}\n\n\t\t\t\t\t\tfreed, err := ms.ForceFree()\n\t\t\t\t\t\tif err != nil {\n\t\t\t\t\t\t\tcclog.Errorf(\"[METRICSTORE]> error while force-freeing buffers: %s\", err)\n\t\t\t\t\t\t}\n\t\t\t\t\t\tif freed == 0 {\n\t\t\t\t\t\t\tcclog.Errorf(\"[METRICSTORE]> no more buffers to free after %d emergency frees, memory usage %.2f GB still exceeds cap %d GB\", freedEmergency, actualMemoryGB, Keys.MemoryCap)\n\t\t\t\t\t\t\tbreak\n\t\t\t\t\t\t}\n\t\t\t\t\t\tfreedEmergency += freed\n\n\t\t\t\t\t\tif i%10 == 0 && freedEmergency > 0 {\n\t\t\t\t\t\t\truntime.ReadMemStats(&mem)\n\t\t\t\t\t\t\tactualMemoryGB = float64(mem.Alloc) / 1e9\n\t\t\t\t\t\t}\n\t\t\t\t\t}\n\n\t\t\t\t\t// if freedEmergency > 0 {\n\t\t\t\t\t// \tdebug.FreeOSMemory()\n\t\t\t\t\t// }\n\n\t\t\t\t\truntime.ReadMemStats(&mem)\n\t\t\t\t\tactualMemoryGB = float64(mem.Alloc) / 1e9\n\n\t\t\t\t\tif actualMemoryGB >= float64(Keys.MemoryCap) {\n\t\t\t\t\t\tcclog.Errorf(\"[METRICSTORE]> after %d emergency frees, memory usage %.2f GB still at/above cap %d GB\", freedEmergency, actualMemoryGB, Keys.MemoryCap)\n\t\t\t\t\t} else {\n\t\t\t\t\t\tcclog.Infof(\"[METRICSTORE]> emergency freeing complete: %d buffers freed, memory now %.2f GB\", freedEmergency, actualMemoryGB)\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t})\n}\n\n// Free removes metric data older than the given time while preserving data for active nodes.\n//\n// This function implements intelligent retention by consulting the NodeProvider (if configured)\n// to determine which nodes are currently in use by running jobs. Data for these nodes is\n// preserved even if older than the retention time.\n//\n// Parameters:\n//   - ms: The MemoryStore instance\n//   - t: Time threshold - buffers with data older than this will be freed\n//\n// Returns:\n//   - Number of buffers freed\n//   - Error if NodeProvider query fails\n//\n// Behavior:\n//   - If no NodeProvider is set: frees all buffers older than t\n//   - If NodeProvider returns empty map: frees all buffers older than t\n//   - Otherwise: preserves buffers for nodes returned by GetUsedNodes(), frees others\nfunc Free(ms *MemoryStore, t time.Time) (int, error) {\n\t// If no NodeProvider is configured, free all buffers older than t\n\tif ms.nodeProvider == nil {\n\t\treturn ms.Free(nil, t.Unix())\n\t}\n\n\texcludeSelectors, err := ms.nodeProvider.GetUsedNodes(t.Unix())\n\tif err != nil {\n\t\treturn 0, err\n\t}\n\n\tswitch lenMap := len(excludeSelectors); lenMap {\n\n\t// If the length of the map returned by GetUsedNodes() is 0,\n\t// then use default Free method with nil selector\n\tcase 0:\n\t\tstate.selectorsExcluded = false\n\t\treturn ms.Free(nil, t.Unix())\n\n\t// Else formulate selectors, exclude those from the map\n\t// and free the rest of the selectors\n\tdefault:\n\t\tstate.selectorsExcluded = true\n\t\tselectors := GetSelectors(ms, excludeSelectors)\n\t\treturn FreeSelected(ms, selectors, t)\n\t}\n}\n\n// FreeSelected frees buffers for specific selectors while preserving others.\n//\n// This function is used when we want to retain some specific nodes beyond the retention time.\n// It iterates through the provided selectors and frees their associated buffers.\n//\n// Parameters:\n//   - ms: The MemoryStore instance\n//   - selectors: List of selector paths to free (e.g., [[\"cluster1\", \"node1\"], [\"cluster2\", \"node2\"]])\n//   - t: Time threshold for freeing buffers\n//\n// Returns the total number of buffers freed and any error encountered.\nfunc FreeSelected(ms *MemoryStore, selectors [][]string, t time.Time) (int, error) {\n\tfreed := 0\n\n\tfor _, selector := range selectors {\n\n\t\tfreedBuffers, err := ms.Free(selector, t.Unix())\n\t\tif err != nil {\n\t\t\tcclog.Errorf(\"error while freeing selected buffers: %#v\", err)\n\t\t}\n\t\tfreed += freedBuffers\n\n\t}\n\n\treturn freed, nil\n}\n\n// GetSelectors returns all selectors at depth 2 (cluster/node level) that are NOT in the exclusion map.\n//\n// This function generates a list of selectors whose buffers should be freed by excluding\n// selectors that correspond to nodes currently in use by running jobs.\n//\n// Parameters:\n//   - ms: The MemoryStore instance\n//   - excludeSelectors: Map of cluster names to node hostnames that should NOT be freed\n//\n// Returns a list of selectors ([]string paths) that can be safely freed.\n//\n// Example:\n//\n//\tIf the tree has paths [\"emmy\", \"node001\"] and [\"emmy\", \"node002\"],\n//\tand excludeSelectors contains {\"emmy\": [\"node001\"]},\n//\tthen only [[\"emmy\", \"node002\"]] is returned.\nfunc GetSelectors(ms *MemoryStore, excludeSelectors map[string][]string) [][]string {\n\tallSelectors := ms.GetPaths(2)\n\n\tfilteredSelectors := make([][]string, 0, len(allSelectors))\n\n\tfor _, path := range allSelectors {\n\t\tif len(path) < 2 {\n\t\t\tcontinue\n\t\t}\n\n\t\tkey := path[0]   // The \"Key\" (Level 1)\n\t\tvalue := path[1] // The \"Value\" (Level 2)\n\n\t\texclude := false\n\n\t\t// Check if the key exists in our exclusion map\n\t\tif excludedValues, exists := excludeSelectors[key]; exists {\n\t\t\t// The key exists, now check if the specific value is in the exclusion list\n\t\t\tif slices.Contains(excludedValues, value) {\n\t\t\t\texclude = true\n\t\t\t}\n\t\t}\n\n\t\tif !exclude {\n\t\t\tfilteredSelectors = append(filteredSelectors, path)\n\t\t}\n\t}\n\n\treturn filteredSelectors\n}\n\n// GetPaths returns a list of lists (paths) to the specified depth.\nfunc (ms *MemoryStore) GetPaths(targetDepth int) [][]string {\n\tvar results [][]string\n\n\t// Start recursion. Initial path is empty.\n\t// We treat Root as depth 0.\n\tms.root.collectPaths(0, targetDepth, []string{}, &results)\n\n\treturn results\n}\n\n// Write all values in `metrics` to the level specified by `selector` for time `ts`.\n// Look at `findLevelOrCreate` for how selectors work.\nfunc (m *MemoryStore) Write(selector []string, ts int64, metrics []Metric) error {\n\tvar ok bool\n\tfor i, metric := range metrics {\n\t\tif metric.MetricConfig.Frequency == 0 {\n\t\t\tmetric.MetricConfig, ok = m.Metrics[metric.Name]\n\t\t\tif !ok {\n\t\t\t\tcclog.Debugf(\"[METRICSTORE]> Unknown metric '%s' in Write() - skipping\", metric.Name)\n\t\t\t\tmetric.MetricConfig.Frequency = 0\n\t\t\t}\n\t\t\tmetrics[i] = metric\n\t\t}\n\t}\n\n\treturn m.WriteToLevel(&m.root, selector, ts, metrics)\n}\n\nfunc (m *MemoryStore) GetLevel(selector []string) *Level {\n\treturn m.root.findLevelOrCreate(selector, len(m.Metrics))\n}\n\n// WriteToLevel assumes that `minfo` in `metrics` is filled in\nfunc (m *MemoryStore) WriteToLevel(l *Level, selector []string, ts int64, metrics []Metric) error {\n\tl = l.findLevelOrCreate(selector, len(m.Metrics))\n\tl.lock.Lock()\n\tdefer l.lock.Unlock()\n\n\tfor _, metric := range metrics {\n\t\tif metric.MetricConfig.Frequency == 0 {\n\t\t\tcontinue\n\t\t}\n\n\t\tb := l.metrics[metric.MetricConfig.offset]\n\t\tif b == nil {\n\t\t\t// First write to this metric and level\n\t\t\tb = newBuffer(ts, metric.MetricConfig.Frequency)\n\t\t\tl.metrics[metric.MetricConfig.offset] = b\n\t\t}\n\n\t\tnb, err := b.write(ts, metric.Value)\n\t\tif err != nil {\n\t\t\treturn err\n\t\t}\n\n\t\t// Last write created a new buffer...\n\t\tif b != nb {\n\t\t\tl.metrics[metric.MetricConfig.offset] = nb\n\t\t}\n\t}\n\treturn nil\n}\n\n// Read returns all values for metric `metric` from `from` to `to` for the selected level(s).\n// If the level does not hold the metric itself, the data will be aggregated recursively from the children.\n// The second and third return value are the actual from/to for the data. Those can be different from\n// the range asked for if no data was available.\nfunc (m *MemoryStore) Read(selector util.Selector, metric string, from, to, resolution int64) ([]schema.Float, int64, int64, int64, error) {\n\tif from > to {\n\t\treturn nil, 0, 0, 0, errors.New(\"[METRICSTORE]> invalid time range\")\n\t}\n\n\tminfo, ok := m.Metrics[metric]\n\tif !ok {\n\t\treturn nil, 0, 0, 0, errors.New(\"[METRICSTORE]> unknown metric: \" + metric)\n\t}\n\n\tn, data := 0, make([]schema.Float, (to-from)/minfo.Frequency+1)\n\n\terr := m.root.findBuffers(selector, minfo.offset, func(b *buffer) error {\n\t\tcdata, cfrom, cto, err := b.read(from, to, data)\n\t\tif err != nil {\n\t\t\treturn err\n\t\t}\n\n\t\tif n == 0 {\n\t\t\tfrom, to = cfrom, cto\n\t\t} else if from != cfrom || to != cto || len(data) != len(cdata) {\n\t\t\tmissingfront, missingback := int((from-cfrom)/minfo.Frequency), int((to-cto)/minfo.Frequency)\n\t\t\tif missingfront != 0 {\n\t\t\t\treturn ErrDataDoesNotAlign\n\t\t\t}\n\n\t\t\tnewlen := len(cdata) - missingback\n\t\t\tif newlen < 1 {\n\t\t\t\treturn ErrDataDoesNotAlign\n\t\t\t}\n\t\t\tcdata = cdata[0:newlen]\n\t\t\tif len(cdata) != len(data) {\n\t\t\t\treturn ErrDataDoesNotAlign\n\t\t\t}\n\n\t\t\tfrom, to = cfrom, cto\n\t\t}\n\n\t\tdata = cdata\n\t\tn += 1\n\t\treturn nil\n\t})\n\n\tif err != nil {\n\t\treturn nil, 0, 0, 0, err\n\t} else if n == 0 {\n\t\treturn nil, 0, 0, 0, ErrNoHostOrMetric\n\t} else if n > 1 {\n\t\tif minfo.Aggregation == AvgAggregation {\n\t\t\tnormalize := 1. / schema.Float(n)\n\t\t\tfor i := 0; i < len(data); i++ {\n\t\t\t\tdata[i] *= normalize\n\t\t\t}\n\t\t} else if minfo.Aggregation != SumAggregation {\n\t\t\treturn nil, 0, 0, 0, errors.New(\"[METRICSTORE]> invalid aggregation\")\n\t\t}\n\t}\n\n\tdata, resolution, err = resampler.LargestTriangleThreeBucket(data, minfo.Frequency, resolution)\n\tif err != nil {\n\t\treturn nil, 0, 0, 0, err\n\t}\n\n\treturn data, from, to, resolution, nil\n}\n\n// Free releases all buffers for the selected level and all its children that\n// contain only values older than `t`.\nfunc (m *MemoryStore) Free(selector []string, t int64) (int, error) {\n\treturn m.GetLevel(selector).free(t)\n}\n\n// ForceFree unconditionally removes the oldest buffer from each metric chain.\nfunc (m *MemoryStore) ForceFree() (int, error) {\n\treturn m.GetLevel(nil).forceFree()\n}\n\nfunc (m *MemoryStore) FreeAll() error {\n\tfor k := range m.root.children {\n\t\tdelete(m.root.children, k)\n\t}\n\n\treturn nil\n}\n\nfunc (m *MemoryStore) SizeInBytes() int64 {\n\treturn m.root.sizeInBytes()\n}\n\nfunc (m *MemoryStore) SizeInGB() float64 {\n\treturn float64(m.root.sizeInBytes()) / 1e9\n}\n\n// ListChildren , given a selector, returns a list of all children of the level\n// selected.\nfunc (m *MemoryStore) ListChildren(selector []string) []string {\n\tlvl := &m.root\n\tfor lvl != nil && len(selector) != 0 {\n\t\tlvl.lock.RLock()\n\t\tnext := lvl.children[selector[0]]\n\t\tlvl.lock.RUnlock()\n\t\tlvl = next\n\t\tselector = selector[1:]\n\t}\n\n\tif lvl == nil {\n\t\treturn nil\n\t}\n\n\tlvl.lock.RLock()\n\tdefer lvl.lock.RUnlock()\n\n\tchildren := make([]string, 0, len(lvl.children))\n\tfor child := range lvl.children {\n\t\tchildren = append(children, child)\n\t}\n\n\treturn children\n}\n","structuredPatch":[{"oldStart":384,"oldLines":14,"newStart":384,"newLines":16,"lines":["   ms := GetMemoryStore()"," ","   wg.Go(func() {","-    d := DefaultMemoryUsageTrackerInterval","+    normalInterval := DefaultMemoryUsageTrackerInterval","+    fastInterval := 30 * time.Second"," ","-    if d <= 0 {","+    if normalInterval <= 0 {","       return","     }"," ","-    ticker := time.NewTicker(d)","+    ticker := time.NewTicker(normalInterval)","     defer ticker.Stop()","+    currentInterval := normalInterval"," ","     for {","       select {"]},{"oldStart":428,"oldLines":48,"newStart":430,"newLines":59,"lines":["         runtime.ReadMemStats(&mem)","         actualMemoryGB = float64(mem.Alloc) / 1e9"," ","-        bufferPool.Clear()","-        cclog.Infof(\"[METRICSTORE]> Cleaned up bufferPool\\n\")","-","         if actualMemoryGB > float64(Keys.MemoryCap) {","           cclog.Warnf(\"[METRICSTORE]> memory usage %.2f GB exceeds cap %d GB, starting emergency buffer freeing\", actualMemoryGB, Keys.MemoryCap)"," ","-          const maxIterations = 100","+          // Use progressive time-based Free with increasing threshold","+          // instead of ForceFree loop — fewer tree traversals, more effective","+          d, parseErr := time.ParseDuration(Keys.RetentionInMemory)","+          if parseErr != nil {","+            cclog.Errorf(\"[METRICSTORE]> cannot parse retention duration: %s\", parseErr)","+          } else {","+            thresholds := []float64{0.75, 0.5, 0.25}","+            for _, fraction := range thresholds {","+              threshold := time.Now().Add(-time.Duration(float64(d) * fraction))","+              freed, freeErr := ms.Free(nil, threshold.Unix())","+              if freeErr != nil {","+                cclog.Errorf(\"[METRICSTORE]> error while freeing buffers at %.0f%% retention: %s\", fraction*100, freeErr)","+              }","+              freedEmergency += freed"," ","-          for i := range maxIterations {","-            if actualMemoryGB < float64(Keys.MemoryCap) {","-              break","-            }","-","-            freed, err := ms.ForceFree()","-            if err != nil {","-              cclog.Errorf(\"[METRICSTORE]> error while force-freeing buffers: %s\", err)","-            }","-            if freed == 0 {","-              cclog.Errorf(\"[METRICSTORE]> no more buffers to free after %d emergency frees, memory usage %.2f GB still exceeds cap %d GB\", freedEmergency, actualMemoryGB, Keys.MemoryCap)","-              break","-            }","-            freedEmergency += freed","-","-            if i%10 == 0 && freedEmergency > 0 {","+              bufferPool.Clear()","+              runtime.GC()","               runtime.ReadMemStats(&mem)","               actualMemoryGB = float64(mem.Alloc) / 1e9","+","+              if actualMemoryGB < float64(Keys.MemoryCap) {","+                break","+              }","             }","           }"," ","-          // if freedEmergency > 0 {","-          // \tdebug.FreeOSMemory()","-          // }","+          bufferPool.Clear()","+          debug.FreeOSMemory()"," ","           runtime.ReadMemStats(&mem)","           actualMemoryGB = float64(mem.Alloc) / 1e9"," ","           if actualMemoryGB >= float64(Keys.MemoryCap) {","-            cclog.Errorf(\"[METRICSTORE]> after %d emergency frees, memory usage %.2f GB still at/above cap %d GB\", freedEmergency, actualMemoryGB, Keys.MemoryCap)","+            cclog.Errorf(\"[METRICSTORE]> after emergency frees (%d buffers), memory usage %.2f GB still at/above cap %d GB\", freedEmergency, actualMemoryGB, Keys.MemoryCap)","           } else {","             cclog.Infof(\"[METRICSTORE]> emergency freeing complete: %d buffers freed, memory now %.2f GB\", freedEmergency, actualMemoryGB)","           }","         }","+","+        // Adaptive ticker: check more frequently when memory is high","+        memoryRatio := actualMemoryGB / float64(Keys.MemoryCap)","+        if memoryRatio > 0.8 && currentInterval != fastInterval {","+          ticker.Reset(fastInterval)","+          currentInterval = fastInterval","+          cclog.Infof(\"[METRICSTORE]> memory at %.0f%% of cap, switching to fast check interval (30s)\", memoryRatio*100)","+        } else if memoryRatio <= 0.8 && currentInterval != normalInterval {","+          ticker.Reset(normalInterval)","+          currentInterval = normalInterval","+          cclog.Infof(\"[METRICSTORE]> memory at %.0f%% of cap, switching to normal check interval\", memoryRatio*100)","+        }","       }","     }","   })"]}],"userModified":false,"replaceAll":false},"sourceToolAssistantUUID":"3c8c66e9-ca84-40e2-9bfa-47a3a0f938e3","userType":"external","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"39705f8c-1691-4d60-b0aa-39f588ed9dcf","version":"2.1.74","gitBranch":"hotfix","slug":"linear-roaming-glade"}
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{"parentUuid":"92394a7c-8965-416a-b4c8-c99a9c505db1","isSidechain":false,"promptId":"a631224c-8362-4377-bee6-9ff6c4b66c68","type":"user","message":{"role":"user","content":[{"tool_use_id":"toolu_01Tz2bqQXkrkd7rgWoMefgbC","type":"tool_result","content":"ok  \tgithub.com/ClusterCockpit/cc-backend/pkg/metricstore\t0.491s","is_error":false}]},"uuid":"0fb2b4ae-62a3-43b6-960b-263e60811913","timestamp":"2026-03-13T06:52:59.718Z","toolUseResult":{"stdout":"ok  \tgithub.com/ClusterCockpit/cc-backend/pkg/metricstore\t0.491s","stderr":"","interrupted":false,"isImage":false,"noOutputExpected":false},"sourceToolAssistantUUID":"92394a7c-8965-416a-b4c8-c99a9c505db1","userType":"external","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"39705f8c-1691-4d60-b0aa-39f588ed9dcf","version":"2.1.74","gitBranch":"hotfix","slug":"linear-roaming-glade"}
{"parentUuid":"0fb2b4ae-62a3-43b6-960b-263e60811913","isSidechain":false,"message":{"model":"claude-opus-4-6","id":"msg_01WmpHVbjD7fUCSMKVaHxdAk","type":"message","role":"assistant","content":[{"type":"text","text":"All tests pass. Here's a summary of the changes:\n\n### Changes made:\n\n1. **`config.go:56`** — Reduced `DefaultMemoryUsageTrackerInterval` from `1 * time.Hour` to `5 * time.Minute` so memory is checked more frequently.\n\n2. **`lineprotocol.go:361-363`** — Changed `return err` to `cclog.Warn(...)` + `continue` so a single out-of-order timestamp no longer aborts the entire NATS batch. Remaining lines are still processed.\n\n3. **`metricstore.go:383-476`** (MemoryUsageTracker) — Three fixes:\n   - **Removed premature `bufferPool.Clear()`** that ran every tick regardless of memory pressure (was preventing freed buffers from being reclaimed by GC since they went back to the pool immediately).\n   - **Replaced the broken `ForceFree` loop** (100 iterations without clearing pool or GC = `mem.Alloc` never decreases) with **progressive `Free(nil, threshold)`** using 75%/50%/25% of retention time, with `bufferPool.Clear()` + `runtime.GC()` between each step so memory stats actually update.\n   - **Added `debug.FreeOSMemory()`** after emergency freeing and **adaptive ticker** (30s when >80% of cap, normal interval otherwise).\n\n4. **`level.go:183-212`** — `free()` now **prunes empty children** from the map after freeing their buffers. Added `isEmpty()` helper. Also improved `sizeInBytes()` to count buffer struct overhead (`unsafe.Sizeof(buffer{})` per node in the linked list), not just float data.\n\n5. **`buffer.go:413-419`** — Added `bufferCount()` helper that counts linked-list nodes for the overhead calculation."}],"stop_reason":"end_turn","stop_sequence":null,"usage":{"input_tokens":1,"cache_creation_input_tokens":138,"cache_read_input_tokens":53848,"output_tokens":453,"server_tool_use":{"web_search_requests":0,"web_fetch_requests":0},"service_tier":"standard","cache_creation":{"ephemeral_1h_input_tokens":138,"ephemeral_5m_input_tokens":0},"inference_geo":"","iterations":[],"speed":"standard"}},"requestId":"req_011CYzdynVzzisnz4TkLSzvc","type":"assistant","uuid":"4abc5754-3474-4365-b2a3-61c325fabf9d","timestamp":"2026-03-13T06:53:12.801Z","userType":"external","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"39705f8c-1691-4d60-b0aa-39f588ed9dcf","version":"2.1.74","gitBranch":"hotfix","slug":"linear-roaming-glade"}
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{"type":"file-history-snapshot","messageId":"c2b3616c-f182-4c9c-8e7f-06fe93f8996b","snapshot":{"messageId":"c2b3616c-f182-4c9c-8e7f-06fe93f8996b","trackedFileBackups":{"pkg/metricstore/config.go":{"backupFileName":"614b3f053f832cad@v2","version":2,"backupTime":"2026-03-13T06:57:19.575Z"},"pkg/metricstore/lineprotocol.go":{"backupFileName":"90dc6599471442f6@v2","version":2,"backupTime":"2026-03-13T06:57:19.575Z"},"pkg/metricstore/buffer.go":{"backupFileName":"d475bbab9788168b@v2","version":2,"backupTime":"2026-03-13T06:57:19.575Z"},"pkg/metricstore/level.go":{"backupFileName":"52feeb980f794693@v2","version":2,"backupTime":"2026-03-13T06:57:19.575Z"},"pkg/metricstore/metricstore.go":{"backupFileName":"9d6c8b589b687438@v2","version":2,"backupTime":"2026-03-13T06:57:19.576Z"}},"timestamp":"2026-03-13T06:57:19.574Z"},"isSnapshotUpdate":false}
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{"parentUuid":"309e5df8-b269-48be-ae5a-b3669cb6d19c","isSidechain":false,"promptId":"3dee3a02-b0d9-414b-ba07-3fb96a789b6f","type":"user","message":{"role":"user","content":[{"tool_use_id":"toolu_017Heu7JmiA2vg5kjXGY8W15","type":"tool_result","content":"On branch hotfix\nYour branch is up to date with 'origin/hotfix'.\n\nChanges not staged for commit:\n  (use \"git add <file>...\" to update what will be committed)\n  (use \"git restore <file>...\" to discard changes in working directory)\n\tmodified:   internal/repository/jobCreate.go\n\tmodified:   pkg/metricstore/buffer.go\n\tmodified:   pkg/metricstore/config.go\n\tmodified:   pkg/metricstore/level.go\n\tmodified:   pkg/metricstore/lineprotocol.go\n\tmodified:   pkg/metricstore/metricstore.go\n\nno changes added to commit (use \"git add\" and/or \"git commit -a\")","is_error":false}]},"uuid":"788e7f82-6546-4c39-9bd1-718e4931c1d4","timestamp":"2026-03-13T06:57:22.192Z","toolUseResult":{"stdout":"On branch hotfix\nYour branch is up to date with 'origin/hotfix'.\n\nChanges not staged for commit:\n  (use \"git add <file>...\" to update what will be committed)\n  (use \"git restore <file>...\" to discard changes in working directory)\n\tmodified:   internal/repository/jobCreate.go\n\tmodified:   pkg/metricstore/buffer.go\n\tmodified:   pkg/metricstore/config.go\n\tmodified:   pkg/metricstore/level.go\n\tmodified:   pkg/metricstore/lineprotocol.go\n\tmodified:   pkg/metricstore/metricstore.go\n\nno changes added to commit (use \"git add\" and/or \"git commit -a\")","stderr":"","interrupted":false,"isImage":false,"noOutputExpected":false},"sourceToolAssistantUUID":"309e5df8-b269-48be-ae5a-b3669cb6d19c","userType":"external","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"39705f8c-1691-4d60-b0aa-39f588ed9dcf","version":"2.1.74","gitBranch":"hotfix","slug":"linear-roaming-glade"}
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{"parentUuid":"7eb73571-ee2a-400d-b4af-b1adbcc10588","isSidechain":false,"promptId":"3dee3a02-b0d9-414b-ba07-3fb96a789b6f","type":"user","message":{"role":"user","content":[{"tool_use_id":"toolu_017sinVFJhGoMH6oBwooJU6L","type":"tool_result","content":"diff --git a/internal/repository/jobCreate.go b/internal/repository/jobCreate.go\nindex 07c8ce11..7047f12f 100644\n--- a/internal/repository/jobCreate.go\n+++ b/internal/repository/jobCreate.go\n@@ -96,13 +96,13 @@ func (r *JobRepository) SyncJobs() ([]*schema.Job, error) {\n \t_, err = r.DB.Exec(\n \t\t\"INSERT OR IGNORE INTO job (job_id, cluster, subcluster, start_time, hpc_user, project, cluster_partition, array_job_id, num_nodes, num_hwthreads, num_acc, shared, monitoring_status, smt, job_state, duration, walltime, footprint, energy, energy_footprint, resources, meta_data) SELECT job_id, cluster, subcluster, start_time, hpc_user, project, cluster_partition, array_job_id, num_nodes, num_hwthreads, num_acc, shared, monitoring_status, smt, job_state, duration, walltime, footprint, energy, energy_footprint, resources, meta_data FROM job_cache\")\n \tif err != nil {\n-\t\tcclog.Warnf(\"Error while Job sync: %v\", err)\n+\t\tcclog.Errorf(\"Error while Job sync: %v\", err)\n \t\treturn nil, err\n \t}\n \n \t_, err = r.DB.Exec(\"DELETE FROM job_cache\")\n \tif err != nil {\n-\t\tcclog.Warnf(\"Error while Job cache clean: %v\", err)\n+\t\tcclog.Errorf(\"Error while Job cache clean: %v\", err)\n \t\treturn nil, err\n \t}\n \n@@ -211,4 +211,3 @@ func (r *JobRepository) Stop(\n \t_, err = stmt.RunWith(r.stmtCache).Exec()\n \treturn err\n }\n-\ndiff --git a/pkg/metricstore/buffer.go b/pkg/metricstore/buffer.go\nindex 2d752006..8530f893 100644\n--- a/pkg/metricstore/buffer.go\n+++ b/pkg/metricstore/buffer.go\n@@ -408,3 +408,12 @@ func (b *buffer) count() int64 {\n \t}\n \treturn res\n }\n+\n+// bufferCount returns the number of buffer nodes in the linked list.\n+func (b *buffer) bufferCount() int64 {\n+\tvar n int64\n+\tfor ; b != nil; b = b.prev {\n+\t\tn++\n+\t}\n+\treturn n\n+}\ndiff --git a/pkg/metricstore/config.go b/pkg/metricstore/config.go\nindex 3b6be529..44743dbe 100644\n--- a/pkg/metricstore/config.go\n+++ b/pkg/metricstore/config.go\n@@ -53,7 +53,7 @@ const (\n \tDefaultMaxWorkers                 = 10\n \tDefaultBufferCapacity             = 512\n \tDefaultGCTriggerInterval          = 100\n-\tDefaultMemoryUsageTrackerInterval = 1 * time.Hour\n+\tDefaultMemoryUsageTrackerInterval = 5 * time.Minute\n )\n \n // Checkpoints configures periodic persistence of in-memory metric data.\ndiff --git a/pkg/metricstore/level.go b/pkg/metricstore/level.go\nindex 2b24a2ea..218ae8e6 100644\n--- a/pkg/metricstore/level.go\n+++ b/pkg/metricstore/level.go\n@@ -200,17 +200,33 @@ func (l *Level) free(t int64) (int, error) {\n \t\t}\n \t}\n \n-\tfor _, l := range l.children {\n-\t\tm, err := l.free(t)\n+\tfor key, child := range l.children {\n+\t\tm, err := child.free(t)\n \t\tn += m\n \t\tif err != nil {\n \t\t\treturn n, err\n \t\t}\n+\t\tif child.isEmpty() {\n+\t\t\tdelete(l.children, key)\n+\t\t}\n \t}\n \n \treturn n, nil\n }\n \n+// isEmpty returns true if this level has no metrics and no children.\n+func (l *Level) isEmpty() bool {\n+\tl.lock.RLock()\n+\tdefer l.lock.RUnlock()\n+\n+\tfor _, b := range l.metrics {\n+\t\tif b != nil {\n+\t\t\treturn false\n+\t\t}\n+\t}\n+\treturn len(l.children) == 0\n+}\n+\n // forceFree removes the oldest buffer from each metric chain in the subtree.\n //\n // Unlike free(), which removes based on time threshold, this unconditionally removes\n@@ -278,6 +294,7 @@ func (l *Level) sizeInBytes() int64 {\n \tfor _, b := range l.metrics {\n \t\tif b != nil {\n \t\t\tsize += b.count() * int64(unsafe.Sizeof(schema.Float(0)))\n+\t\t\tsize += b.bufferCount() * int64(unsafe.Sizeof(buffer{}))\n \t\t}\n \t}\n \ndiff --git a/pkg/metricstore/lineprotocol.go b/pkg/metricstore/lineprotocol.go\nindex ecae3df1..21f036ed 100644\n--- a/pkg/metricstore/lineprotocol.go\n+++ b/pkg/metricstore/lineprotocol.go\n@@ -359,7 +359,8 @@ func DecodeLine(dec *lineprotocol.Decoder,\n \t\t}\n \n \t\tif err := ms.WriteToLevel(lvl, st.selector, time, []Metric{metric}); err != nil {\n-\t\t\treturn err\n+\t\t\tcclog.Warnf(\"write error for host %s metric %s at ts %d: %s\", host, string(st.metricBuf), time, err.Error())\n+\t\t\tcontinue\n \t\t}\n \t}\n \treturn nil\ndiff --git a/pkg/metricstore/metricstore.go b/pkg/metricstore/metricstore.go\nindex b6fbb51a..85eb0baf 100644\n--- a/pkg/metricstore/metricstore.go\n+++ b/pkg/metricstore/metricstore.go\n@@ -384,14 +384,16 @@ func MemoryUsageTracker(wg *sync.WaitGroup, ctx context.Context) {\n \tms := GetMemoryStore()\n \n \twg.Go(func() {\n-\t\td := DefaultMemoryUsageTrackerInterval\n+\t\tnormalInterval := DefaultMemoryUsageTrackerInterval\n+\t\tfastInterval := 30 * time.Second\n \n-\t\tif d <= 0 {\n+\t\tif normalInterval <= 0 {\n \t\t\treturn\n \t\t}\n \n-\t\tticker := time.NewTicker(d)\n+\t\tticker := time.NewTicker(normalInterval)\n \t\tdefer ticker.Stop()\n+\t\tcurrentInterval := normalInterval\n \n \t\tfor {\n \t\t\tselect {\n@@ -428,48 +430,59 @@ func MemoryUsageTracker(wg *sync.WaitGroup, ctx context.Context) {\n \t\t\t\truntime.ReadMemStats(&mem)\n \t\t\t\tactualMemoryGB = float64(mem.Alloc) / 1e9\n \n-\t\t\t\tbufferPool.Clear()\n-\t\t\t\tcclog.Infof(\"[METRICSTORE]> Cleaned up bufferPool\\n\")\n-\n \t\t\t\tif actualMemoryGB > float64(Keys.MemoryCap) {\n \t\t\t\t\tcclog.Warnf(\"[METRICSTORE]> memory usage %.2f GB exceeds cap %d GB, starting emergency buffer freeing\", actualMemoryGB, Keys.MemoryCap)\n \n-\t\t\t\t\tconst maxIterations = 100\n-\n-\t\t\t\t\tfor i := range maxIterations {\n-\t\t\t\t\t\tif actualMemoryGB < float64(Keys.MemoryCap) {\n-\t\t\t\t\t\t\tbreak\n-\t\t\t\t\t\t}\n-\n-\t\t\t\t\t\tfreed, err := ms.ForceFree()\n-\t\t\t\t\t\tif err != nil {\n-\t\t\t\t\t\t\tcclog.Errorf(\"[METRICSTORE]> error while force-freeing buffers: %s\", err)\n-\t\t\t\t\t\t}\n-\t\t\t\t\t\tif freed == 0 {\n-\t\t\t\t\t\t\tcclog.Errorf(\"[METRICSTORE]> no more buffers to free after %d emergency frees, memory usage %.2f GB still exceeds cap %d GB\", freedEmergency, actualMemoryGB, Keys.MemoryCap)\n-\t\t\t\t\t\t\tbreak\n-\t\t\t\t\t\t}\n-\t\t\t\t\t\tfreedEmergency += freed\n-\n-\t\t\t\t\t\tif i%10 == 0 && freedEmergency > 0 {\n+\t\t\t\t\t// Use progressive time-based Free with increasing threshold\n+\t\t\t\t\t// instead of ForceFree loop — fewer tree traversals, more effective\n+\t\t\t\t\td, parseErr := time.ParseDuration(Keys.RetentionInMemory)\n+\t\t\t\t\tif parseErr != nil {\n+\t\t\t\t\t\tcclog.Errorf(\"[METRICSTORE]> cannot parse retention duration: %s\", parseErr)\n+\t\t\t\t\t} else {\n+\t\t\t\t\t\tthresholds := []float64{0.75, 0.5, 0.25}\n+\t\t\t\t\t\tfor _, fraction := range thresholds {\n+\t\t\t\t\t\t\tthreshold := time.Now().Add(-time.Duration(float64(d) * fraction))\n+\t\t\t\t\t\t\tfreed, freeErr := ms.Free(nil, threshold.Unix())\n+\t\t\t\t\t\t\tif freeErr != nil {\n+\t\t\t\t\t\t\t\tcclog.Errorf(\"[METRICSTORE]> error while freeing buffers at %.0f%% retention: %s\", fraction*100, freeErr)\n+\t\t\t\t\t\t\t}\n+\t\t\t\t\t\t\tfreedEmergency += freed\n+\n+\t\t\t\t\t\t\tbufferPool.Clear()\n+\t\t\t\t\t\t\truntime.GC()\n \t\t\t\t\t\t\truntime.ReadMemStats(&mem)\n \t\t\t\t\t\t\tactualMemoryGB = float64(mem.Alloc) / 1e9\n+\n+\t\t\t\t\t\t\tif actualMemoryGB < float64(Keys.MemoryCap) {\n+\t\t\t\t\t\t\t\tbreak\n+\t\t\t\t\t\t\t}\n \t\t\t\t\t\t}\n \t\t\t\t\t}\n \n-\t\t\t\t\t// if freedEmergency > 0 {\n-\t\t\t\t\t// \tdebug.FreeOSMemory()\n-\t\t\t\t\t// }\n+\t\t\t\t\tbufferPool.Clear()\n+\t\t\t\t\tdebug.FreeOSMemory()\n \n \t\t\t\t\truntime.ReadMemStats(&mem)\n \t\t\t\t\tactualMemoryGB = float64(mem.Alloc) / 1e9\n \n \t\t\t\t\tif actualMemoryGB >= float64(Keys.MemoryCap) {\n-\t\t\t\t\t\tcclog.Errorf(\"[METRICSTORE]> after %d emergency frees, memory usage %.2f GB still at/above cap %d GB\", freedEmergency, actualMemoryGB, Keys.MemoryCap)\n+\t\t\t\t\t\tcclog.Errorf(\"[METRICSTORE]> after emergency frees (%d buffers), memory usage %.2f GB still at/above cap %d GB\", freedEmergency, actualMemoryGB, Keys.MemoryCap)\n \t\t\t\t\t} else {\n \t\t\t\t\t\tcclog.Infof(\"[METRICSTORE]> emergency freeing complete: %d buffers freed, memory now %.2f GB\", freedEmergency, actualMemoryGB)\n \t\t\t\t\t}\n \t\t\t\t}\n+\n+\t\t\t\t// Adaptive ticker: check more frequently when memory is high\n+\t\t\t\tmemoryRatio := actualMemoryGB / float64(Keys.MemoryCap)\n+\t\t\t\tif memoryRatio > 0.8 && currentInterval != fastInterval {\n+\t\t\t\t\tticker.Reset(fastInterval)\n+\t\t\t\t\tcurrentInterval = fastInterval\n+\t\t\t\t\tcclog.Infof(\"[METRICSTORE]> memory at %.0f%% of cap, switching to fast check interval (30s)\", memoryRatio*100)\n+\t\t\t\t} else if memoryRatio <= 0.8 && currentInterval != normalInterval {\n+\t\t\t\t\tticker.Reset(normalInterval)\n+\t\t\t\t\tcurrentInterval = normalInterval\n+\t\t\t\t\tcclog.Infof(\"[METRICSTORE]> memory at %.0f%% of cap, switching to normal check interval\", memoryRatio*100)\n+\t\t\t\t}\n \t\t\t}\n \t\t}\n \t})","is_error":false}]},"uuid":"4c5fcc00-6e6b-4f4d-a3b6-17974f9a0ec5","timestamp":"2026-03-13T06:57:22.687Z","toolUseResult":{"stdout":"diff --git a/internal/repository/jobCreate.go b/internal/repository/jobCreate.go\nindex 07c8ce11..7047f12f 100644\n--- a/internal/repository/jobCreate.go\n+++ b/internal/repository/jobCreate.go\n@@ -96,13 +96,13 @@ func (r *JobRepository) SyncJobs() ([]*schema.Job, error) {\n \t_, err = r.DB.Exec(\n \t\t\"INSERT OR IGNORE INTO job (job_id, cluster, subcluster, start_time, hpc_user, project, cluster_partition, array_job_id, num_nodes, num_hwthreads, num_acc, shared, monitoring_status, smt, job_state, duration, walltime, footprint, energy, energy_footprint, resources, meta_data) SELECT job_id, cluster, subcluster, start_time, hpc_user, project, cluster_partition, array_job_id, num_nodes, num_hwthreads, num_acc, shared, monitoring_status, smt, job_state, duration, walltime, footprint, energy, energy_footprint, resources, meta_data FROM job_cache\")\n \tif err != nil {\n-\t\tcclog.Warnf(\"Error while Job sync: %v\", err)\n+\t\tcclog.Errorf(\"Error while Job sync: %v\", err)\n \t\treturn nil, err\n \t}\n \n \t_, err = r.DB.Exec(\"DELETE FROM job_cache\")\n \tif err != nil {\n-\t\tcclog.Warnf(\"Error while Job cache clean: %v\", err)\n+\t\tcclog.Errorf(\"Error while Job cache clean: %v\", err)\n \t\treturn nil, err\n \t}\n \n@@ -211,4 +211,3 @@ func (r *JobRepository) Stop(\n \t_, err = stmt.RunWith(r.stmtCache).Exec()\n \treturn err\n }\n-\ndiff --git a/pkg/metricstore/buffer.go b/pkg/metricstore/buffer.go\nindex 2d752006..8530f893 100644\n--- a/pkg/metricstore/buffer.go\n+++ b/pkg/metricstore/buffer.go\n@@ -408,3 +408,12 @@ func (b *buffer) count() int64 {\n \t}\n \treturn res\n }\n+\n+// bufferCount returns the number of buffer nodes in the linked list.\n+func (b *buffer) bufferCount() int64 {\n+\tvar n int64\n+\tfor ; b != nil; b = b.prev {\n+\t\tn++\n+\t}\n+\treturn n\n+}\ndiff --git a/pkg/metricstore/config.go b/pkg/metricstore/config.go\nindex 3b6be529..44743dbe 100644\n--- a/pkg/metricstore/config.go\n+++ b/pkg/metricstore/config.go\n@@ -53,7 +53,7 @@ const (\n \tDefaultMaxWorkers                 = 10\n \tDefaultBufferCapacity             = 512\n \tDefaultGCTriggerInterval          = 100\n-\tDefaultMemoryUsageTrackerInterval = 1 * time.Hour\n+\tDefaultMemoryUsageTrackerInterval = 5 * time.Minute\n )\n \n // Checkpoints configures periodic persistence of in-memory metric data.\ndiff --git a/pkg/metricstore/level.go b/pkg/metricstore/level.go\nindex 2b24a2ea..218ae8e6 100644\n--- a/pkg/metricstore/level.go\n+++ b/pkg/metricstore/level.go\n@@ -200,17 +200,33 @@ func (l *Level) free(t int64) (int, error) {\n \t\t}\n \t}\n \n-\tfor _, l := range l.children {\n-\t\tm, err := l.free(t)\n+\tfor key, child := range l.children {\n+\t\tm, err := child.free(t)\n \t\tn += m\n \t\tif err != nil {\n \t\t\treturn n, err\n \t\t}\n+\t\tif child.isEmpty() {\n+\t\t\tdelete(l.children, key)\n+\t\t}\n \t}\n \n \treturn n, nil\n }\n \n+// isEmpty returns true if this level has no metrics and no children.\n+func (l *Level) isEmpty() bool {\n+\tl.lock.RLock()\n+\tdefer l.lock.RUnlock()\n+\n+\tfor _, b := range l.metrics {\n+\t\tif b != nil {\n+\t\t\treturn false\n+\t\t}\n+\t}\n+\treturn len(l.children) == 0\n+}\n+\n // forceFree removes the oldest buffer from each metric chain in the subtree.\n //\n // Unlike free(), which removes based on time threshold, this unconditionally removes\n@@ -278,6 +294,7 @@ func (l *Level) sizeInBytes() int64 {\n \tfor _, b := range l.metrics {\n \t\tif b != nil {\n \t\t\tsize += b.count() * int64(unsafe.Sizeof(schema.Float(0)))\n+\t\t\tsize += b.bufferCount() * int64(unsafe.Sizeof(buffer{}))\n \t\t}\n \t}\n \ndiff --git a/pkg/metricstore/lineprotocol.go b/pkg/metricstore/lineprotocol.go\nindex ecae3df1..21f036ed 100644\n--- a/pkg/metricstore/lineprotocol.go\n+++ b/pkg/metricstore/lineprotocol.go\n@@ -359,7 +359,8 @@ func DecodeLine(dec *lineprotocol.Decoder,\n \t\t}\n \n \t\tif err := ms.WriteToLevel(lvl, st.selector, time, []Metric{metric}); err != nil {\n-\t\t\treturn err\n+\t\t\tcclog.Warnf(\"write error for host %s metric %s at ts %d: %s\", host, string(st.metricBuf), time, err.Error())\n+\t\t\tcontinue\n \t\t}\n \t}\n \treturn nil\ndiff --git a/pkg/metricstore/metricstore.go b/pkg/metricstore/metricstore.go\nindex b6fbb51a..85eb0baf 100644\n--- a/pkg/metricstore/metricstore.go\n+++ b/pkg/metricstore/metricstore.go\n@@ -384,14 +384,16 @@ func MemoryUsageTracker(wg *sync.WaitGroup, ctx context.Context) {\n \tms := GetMemoryStore()\n \n \twg.Go(func() {\n-\t\td := DefaultMemoryUsageTrackerInterval\n+\t\tnormalInterval := DefaultMemoryUsageTrackerInterval\n+\t\tfastInterval := 30 * time.Second\n \n-\t\tif d <= 0 {\n+\t\tif normalInterval <= 0 {\n \t\t\treturn\n \t\t}\n \n-\t\tticker := time.NewTicker(d)\n+\t\tticker := time.NewTicker(normalInterval)\n \t\tdefer ticker.Stop()\n+\t\tcurrentInterval := normalInterval\n \n \t\tfor {\n \t\t\tselect {\n@@ -428,48 +430,59 @@ func MemoryUsageTracker(wg *sync.WaitGroup, ctx context.Context) {\n \t\t\t\truntime.ReadMemStats(&mem)\n \t\t\t\tactualMemoryGB = float64(mem.Alloc) / 1e9\n \n-\t\t\t\tbufferPool.Clear()\n-\t\t\t\tcclog.Infof(\"[METRICSTORE]> Cleaned up bufferPool\\n\")\n-\n \t\t\t\tif actualMemoryGB > float64(Keys.MemoryCap) {\n \t\t\t\t\tcclog.Warnf(\"[METRICSTORE]> memory usage %.2f GB exceeds cap %d GB, starting emergency buffer freeing\", actualMemoryGB, Keys.MemoryCap)\n \n-\t\t\t\t\tconst maxIterations = 100\n-\n-\t\t\t\t\tfor i := range maxIterations {\n-\t\t\t\t\t\tif actualMemoryGB < float64(Keys.MemoryCap) {\n-\t\t\t\t\t\t\tbreak\n-\t\t\t\t\t\t}\n-\n-\t\t\t\t\t\tfreed, err := ms.ForceFree()\n-\t\t\t\t\t\tif err != nil {\n-\t\t\t\t\t\t\tcclog.Errorf(\"[METRICSTORE]> error while force-freeing buffers: %s\", err)\n-\t\t\t\t\t\t}\n-\t\t\t\t\t\tif freed == 0 {\n-\t\t\t\t\t\t\tcclog.Errorf(\"[METRICSTORE]> no more buffers to free after %d emergency frees, memory usage %.2f GB still exceeds cap %d GB\", freedEmergency, actualMemoryGB, Keys.MemoryCap)\n-\t\t\t\t\t\t\tbreak\n-\t\t\t\t\t\t}\n-\t\t\t\t\t\tfreedEmergency += freed\n-\n-\t\t\t\t\t\tif i%10 == 0 && freedEmergency > 0 {\n+\t\t\t\t\t// Use progressive time-based Free with increasing threshold\n+\t\t\t\t\t// instead of ForceFree loop — fewer tree traversals, more effective\n+\t\t\t\t\td, parseErr := time.ParseDuration(Keys.RetentionInMemory)\n+\t\t\t\t\tif parseErr != nil {\n+\t\t\t\t\t\tcclog.Errorf(\"[METRICSTORE]> cannot parse retention duration: %s\", parseErr)\n+\t\t\t\t\t} else {\n+\t\t\t\t\t\tthresholds := []float64{0.75, 0.5, 0.25}\n+\t\t\t\t\t\tfor _, fraction := range thresholds {\n+\t\t\t\t\t\t\tthreshold := time.Now().Add(-time.Duration(float64(d) * fraction))\n+\t\t\t\t\t\t\tfreed, freeErr := ms.Free(nil, threshold.Unix())\n+\t\t\t\t\t\t\tif freeErr != nil {\n+\t\t\t\t\t\t\t\tcclog.Errorf(\"[METRICSTORE]> error while freeing buffers at %.0f%% retention: %s\", fraction*100, freeErr)\n+\t\t\t\t\t\t\t}\n+\t\t\t\t\t\t\tfreedEmergency += freed\n+\n+\t\t\t\t\t\t\tbufferPool.Clear()\n+\t\t\t\t\t\t\truntime.GC()\n \t\t\t\t\t\t\truntime.ReadMemStats(&mem)\n \t\t\t\t\t\t\tactualMemoryGB = float64(mem.Alloc) / 1e9\n+\n+\t\t\t\t\t\t\tif actualMemoryGB < float64(Keys.MemoryCap) {\n+\t\t\t\t\t\t\t\tbreak\n+\t\t\t\t\t\t\t}\n \t\t\t\t\t\t}\n \t\t\t\t\t}\n \n-\t\t\t\t\t// if freedEmergency > 0 {\n-\t\t\t\t\t// \tdebug.FreeOSMemory()\n-\t\t\t\t\t// }\n+\t\t\t\t\tbufferPool.Clear()\n+\t\t\t\t\tdebug.FreeOSMemory()\n \n \t\t\t\t\truntime.ReadMemStats(&mem)\n \t\t\t\t\tactualMemoryGB = float64(mem.Alloc) / 1e9\n \n \t\t\t\t\tif actualMemoryGB >= float64(Keys.MemoryCap) {\n-\t\t\t\t\t\tcclog.Errorf(\"[METRICSTORE]> after %d emergency frees, memory usage %.2f GB still at/above cap %d GB\", freedEmergency, actualMemoryGB, Keys.MemoryCap)\n+\t\t\t\t\t\tcclog.Errorf(\"[METRICSTORE]> after emergency frees (%d buffers), memory usage %.2f GB still at/above cap %d GB\", freedEmergency, actualMemoryGB, Keys.MemoryCap)\n \t\t\t\t\t} else {\n \t\t\t\t\t\tcclog.Infof(\"[METRICSTORE]> emergency freeing complete: %d buffers freed, memory now %.2f GB\", freedEmergency, actualMemoryGB)\n \t\t\t\t\t}\n \t\t\t\t}\n+\n+\t\t\t\t// Adaptive ticker: check more frequently when memory is high\n+\t\t\t\tmemoryRatio := actualMemoryGB / float64(Keys.MemoryCap)\n+\t\t\t\tif memoryRatio > 0.8 && currentInterval != fastInterval {\n+\t\t\t\t\tticker.Reset(fastInterval)\n+\t\t\t\t\tcurrentInterval = fastInterval\n+\t\t\t\t\tcclog.Infof(\"[METRICSTORE]> memory at %.0f%% of cap, switching to fast check interval (30s)\", memoryRatio*100)\n+\t\t\t\t} else if memoryRatio <= 0.8 && currentInterval != normalInterval {\n+\t\t\t\t\tticker.Reset(normalInterval)\n+\t\t\t\t\tcurrentInterval = normalInterval\n+\t\t\t\t\tcclog.Infof(\"[METRICSTORE]> memory at %.0f%% of cap, switching to normal check interval\", memoryRatio*100)\n+\t\t\t\t}\n \t\t\t}\n \t\t}\n \t})","stderr":"","interrupted":false,"isImage":false,"noOutputExpected":false},"sourceToolAssistantUUID":"7eb73571-ee2a-400d-b4af-b1adbcc10588","userType":"external","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"39705f8c-1691-4d60-b0aa-39f588ed9dcf","version":"2.1.74","gitBranch":"hotfix","slug":"linear-roaming-glade"}
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{"parentUuid":"41343b67-7f69-49d7-a2d9-58392ce93086","isSidechain":false,"promptId":"3dee3a02-b0d9-414b-ba07-3fb96a789b6f","type":"user","message":{"role":"user","content":[{"tool_use_id":"toolu_01YZHQdpMKJUvqon1DwtQ21R","type":"tool_result","content":"126f6587 Update Release informations\n3aacc669 Remove debug timer\n96fc44a6 fix: Optimize project stat query\n8e86e872 Make stats query selective. Add stats index. Add paging to user list.\n4555fb8a Merge branch 'hotfix' of github.com:ClusterCockpit/cc-backend into hotfix","is_error":false}]},"uuid":"30183768-6698-478e-b1dc-3a1c17be2a47","timestamp":"2026-03-13T06:57:23.094Z","toolUseResult":{"stdout":"126f6587 Update Release informations\n3aacc669 Remove debug timer\n96fc44a6 fix: Optimize project stat query\n8e86e872 Make stats query selective. Add stats index. Add paging to user list.\n4555fb8a Merge branch 'hotfix' of github.com:ClusterCockpit/cc-backend into hotfix","stderr":"","interrupted":false,"isImage":false,"noOutputExpected":false},"sourceToolAssistantUUID":"41343b67-7f69-49d7-a2d9-58392ce93086","userType":"external","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"39705f8c-1691-4d60-b0aa-39f588ed9dcf","version":"2.1.74","gitBranch":"hotfix","slug":"linear-roaming-glade"}
{"parentUuid":"30183768-6698-478e-b1dc-3a1c17be2a47","isSidechain":false,"message":{"model":"claude-opus-4-6","id":"msg_01PpuJwbQfeoRGdPMwMXCA5y","type":"message","role":"assistant","content":[{"type":"text","text":"Note: `internal/repository/jobCreate.go` has pre-existing changes (unrelated log level fix). I'll commit only the metricstore files."}],"stop_reason":null,"stop_sequence":null,"usage":{"input_tokens":1,"cache_creation_input_tokens":3601,"cache_read_input_tokens":54504,"cache_creation":{"ephemeral_5m_input_tokens":0,"ephemeral_1h_input_tokens":3601},"output_tokens":1,"service_tier":"standard","inference_geo":"not_available"}},"requestId":"req_011CYzeKCZ8oFRGgPfr7mbmf","type":"assistant","uuid":"8c8873bd-c949-4d80-8c9c-10002740dbe7","timestamp":"2026-03-13T06:57:26.646Z","userType":"external","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"39705f8c-1691-4d60-b0aa-39f588ed9dcf","version":"2.1.74","gitBranch":"hotfix","slug":"linear-roaming-glade"}
{"parentUuid":"8c8873bd-c949-4d80-8c9c-10002740dbe7","isSidechain":false,"message":{"model":"claude-opus-4-6","id":"msg_01PpuJwbQfeoRGdPMwMXCA5y","type":"message","role":"assistant","content":[{"type":"tool_use","id":"toolu_01D7sm5LtPELaC49u4eQDQ9R","name":"Bash","input":{"command":"git add pkg/metricstore/buffer.go pkg/metricstore/config.go pkg/metricstore/level.go pkg/metricstore/lineprotocol.go pkg/metricstore/metricstore.go && git commit -m \"$(cat <<'EOF'\nfix: Fix metricstore memory explosion from broken emergency free and batch aborts\n\n- Fix MemoryUsageTracker: remove premature bufferPool.Clear() that prevented\n  mem.Alloc from decreasing, replace broken ForceFree loop (100 iterations\n  with no GC) with progressive time-based Free at 75%/50%/25% retention,\n  add bufferPool.Clear()+GC between steps so memory stats update correctly\n- Enable debug.FreeOSMemory() after emergency freeing to return memory to OS\n- Add adaptive ticker: 30s checks when memory >80% of cap, normal otherwise\n- Reduce default memory check interval from 1h to 5min\n- Don't abort entire NATS batch on single write error (out-of-order timestamp),\n  log warning and continue processing remaining lines\n- Prune empty levels from tree after free() to reduce overhead\n- Include buffer struct overhead in sizeInBytes() for more accurate reporting\n\nCo-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>\nEOF\n)\"","description":"Commit metricstore memory fix changes"},"caller":{"type":"direct"}}],"stop_reason":"tool_use","stop_sequence":null,"usage":{"input_tokens":1,"cache_creation_input_tokens":3601,"cache_read_input_tokens":54504,"output_tokens":428,"server_tool_use":{"web_search_requests":0,"web_fetch_requests":0},"service_tier":"standard","cache_creation":{"ephemeral_1h_input_tokens":3601,"ephemeral_5m_input_tokens":0},"inference_geo":"","iterations":[],"speed":"standard"}},"requestId":"req_011CYzeKCZ8oFRGgPfr7mbmf","type":"assistant","uuid":"93380279-8b97-44fd-8203-5cb22c742e3d","timestamp":"2026-03-13T06:57:35.527Z","userType":"external","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"39705f8c-1691-4d60-b0aa-39f588ed9dcf","version":"2.1.74","gitBranch":"hotfix","slug":"linear-roaming-glade"}
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