Pull out metric List build from metricstore Init

cmd/cc-backend/main.go

@@ -321,7 +321,8 @@ func runServer(ctx context.Context) error {
 	haveMetricstore := false
 	mscfg := ccconf.GetPackageConfig("metric-store")
 	if mscfg != nil {
-		metricstore.Init(mscfg, &wg)
+		metrics := metricstore.BuildMetricList()
+		metricstore.Init(mscfg, metrics, &wg)
 
 		// Inject repository as NodeProvider to break import cycle
 		ms := metricstore.GetMemoryStore()

pkg/metricstore/avroHelper.go

@@ -24,6 +24,7 @@ func DataStaging(wg *sync.WaitGroup, ctx context.Context) {
 
 		defer wg.Done()
 
+		ms := GetMemoryStore()
 		var avroLevel *AvroLevel
 		oldSelector := make([]string, 0)
 
@@ -39,7 +40,7 @@ func DataStaging(wg *sync.WaitGroup, ctx context.Context) {
 							return
 						}
 						// Process remaining message
-						freq, err := GetMetricFrequency(val.MetricName)
+						freq, err := ms.GetMetricFrequency(val.MetricName)
 						if err != nil {
 							continue
 						}
@@ -76,7 +77,7 @@ func DataStaging(wg *sync.WaitGroup, ctx context.Context) {
 				}
 
 				// Fetch the frequency of the metric from the global configuration
-				freq, err := GetMetricFrequency(val.MetricName)
+				freq, err := ms.GetMetricFrequency(val.MetricName)
 				if err != nil {
 					cclog.Errorf("Error fetching metric frequency: %s\n", err)
 					continue

pkg/metricstore/config.go

@@ -45,6 +45,10 @@ package metricstore
 import (
 	"fmt"
 	"time"
+
+	"github.com/ClusterCockpit/cc-backend/pkg/archive"
+	cclog "github.com/ClusterCockpit/cc-lib/v2/ccLogger"
+	"github.com/ClusterCockpit/cc-lib/v2/schema"
 )
 
 const (
@@ -207,55 +211,51 @@ type MetricConfig struct {
 	offset int
 }
 
-// Metrics is the global map of metric configurations.
-//
-// Keyed by metric name (e.g., "cpu_load", "mem_used"). Populated during Init()
-// from cluster configuration and checkpoint restoration. Each MetricConfig.offset
-// corresponds to the buffer slice index in Level.metrics.
-var Metrics map[string]MetricConfig
+func BuildMetricList() map[string]MetricConfig {
+	var metrics map[string]MetricConfig = make(map[string]MetricConfig)
 
-// GetMetricFrequency retrieves the measurement interval for a metric.
-//
-// Parameters:
-//   - metricName: Metric name (e.g., "cpu_load")
-//
-// Returns:
-//   - int64: Frequency in seconds
-//   - error: Non-nil if metric not found in Metrics map
-func GetMetricFrequency(metricName string) (int64, error) {
-	if metric, ok := Metrics[metricName]; ok {
-		return metric.Frequency, nil
-	}
-	return 0, fmt.Errorf("[METRICSTORE]> metric %s not found", metricName)
-}
+	addMetric := func(name string, metric MetricConfig) error {
+		if metrics == nil {
+			metrics = make(map[string]MetricConfig, 0)
+		}
 
-// AddMetric registers a new metric or updates an existing one.
-//
-// If the metric already exists with a different frequency, uses the higher frequency
-// (finer granularity). This handles cases where different clusters report the same
-// metric at different intervals.
-//
-// Parameters:
-//   - name:   Metric name (e.g., "cpu_load")
-//   - metric: Configuration (frequency, aggregation strategy)
-//
-// Returns:
-//   - error: Always nil (signature for future error handling)
-func AddMetric(name string, metric MetricConfig) error {
-	if Metrics == nil {
-		Metrics = make(map[string]MetricConfig, 0)
+		if existingMetric, ok := metrics[name]; ok {
+			if existingMetric.Frequency != metric.Frequency {
+				if existingMetric.Frequency < metric.Frequency {
+					existingMetric.Frequency = metric.Frequency
+					metrics[name] = existingMetric
+				}
+			}
+		} else {
+			metrics[name] = metric
+		}
+
+		return nil
 	}
 
-	if existingMetric, ok := Metrics[name]; ok {
-		if existingMetric.Frequency != metric.Frequency {
-			if existingMetric.Frequency < metric.Frequency {
-				existingMetric.Frequency = metric.Frequency
-				Metrics[name] = existingMetric
+	// Helper function to add metric configuration
+	addMetricConfig := func(mc *schema.MetricConfig) {
+		agg, err := AssignAggregationStrategy(mc.Aggregation)
+		if err != nil {
+			cclog.Warnf("Could not find aggregation strategy for metric config '%s': %s", mc.Name, err.Error())
+		}
+
+		addMetric(mc.Name, MetricConfig{
+			Frequency:   int64(mc.Timestep),
+			Aggregation: agg,
+		})
+	}
+	for _, c := range archive.Clusters {
+		for _, mc := range c.MetricConfig {
+			addMetricConfig(mc)
+		}
+
+		for _, sc := range c.SubClusters {
+			for _, mc := range sc.MetricConfig {
+				addMetricConfig(mc)
 			}
 		}
-	} else {
-		Metrics[name] = metric
 	}
 
-	return nil
+	return metrics
 }

pkg/metricstore/metricstore.go

@@ -24,13 +24,13 @@ import (
 	"context"
 	"encoding/json"
 	"errors"
+	"fmt"
 	"runtime"
 	"slices"
 	"sync"
 	"time"
 
 	"github.com/ClusterCockpit/cc-backend/internal/config"
-	"github.com/ClusterCockpit/cc-backend/pkg/archive"
 	cclog "github.com/ClusterCockpit/cc-lib/v2/ccLogger"
 	"github.com/ClusterCockpit/cc-lib/v2/resampler"
 	"github.com/ClusterCockpit/cc-lib/v2/schema"
@@ -120,7 +120,7 @@ type MemoryStore struct {
 //
 // Note: Signal handling must be implemented by the caller. Call Shutdown() when
 // receiving termination signals to ensure checkpoint data is persisted.
-func Init(rawConfig json.RawMessage, wg *sync.WaitGroup) {
+func Init(rawConfig json.RawMessage, metrics map[string]MetricConfig, wg *sync.WaitGroup) {
 	startupTime := time.Now()
 
 	if rawConfig != nil {
@@ -138,33 +138,8 @@ func Init(rawConfig json.RawMessage, wg *sync.WaitGroup) {
 	}
 	cclog.Debugf("[METRICSTORE]> Using %d workers for checkpoint/archive operations\n", Keys.NumWorkers)
 
-	// Helper function to add metric configuration
-	addMetricConfig := func(mc *schema.MetricConfig) {
-		agg, err := AssignAggregationStrategy(mc.Aggregation)
-		if err != nil {
-			cclog.Warnf("Could not find aggregation strategy for metric config '%s': %s", mc.Name, err.Error())
-		}
-
-		AddMetric(mc.Name, MetricConfig{
-			Frequency:   int64(mc.Timestep),
-			Aggregation: agg,
-		})
-	}
-
-	for _, c := range archive.Clusters {
-		for _, mc := range c.MetricConfig {
-			addMetricConfig(mc)
-		}
-
-		for _, sc := range c.SubClusters {
-			for _, mc := range sc.MetricConfig {
-				addMetricConfig(mc)
-			}
-		}
-	}
-
 	// Pass the config.MetricStoreKeys
-	InitMetrics(Metrics)
+	InitMetrics(metrics)
 
 	ms := GetMemoryStore()
 
@@ -279,6 +254,13 @@ func GetMemoryStore() *MemoryStore {
 	return msInstance
 }
 
+func (ms *MemoryStore) GetMetricFrequency(metricName string) (int64, error) {
+	if metric, ok := ms.Metrics[metricName]; ok {
+		return metric.Frequency, nil
+	}
+	return 0, fmt.Errorf("[METRICSTORE]> metric %s not found", metricName)
+}
+
 // SetNodeProvider sets the NodeProvider implementation for the MemoryStore.
 // This must be called during initialization to provide job state information
 // for selective buffer retention during Free operations.

pkg/metricstore/metricstore_test.go

@@ -38,72 +38,6 @@ func TestAssignAggregationStrategy(t *testing.T) {
 	}
 }
 
-func TestAddMetric(t *testing.T) {
-	// Reset Metrics before test
-	Metrics = make(map[string]MetricConfig)
-
-	err := AddMetric("test_metric", MetricConfig{
-		Frequency:   60,
-		Aggregation: SumAggregation,
-	})
-	if err != nil {
-		t.Errorf("AddMetric() error = %v", err)
-	}
-
-	if _, ok := Metrics["test_metric"]; !ok {
-		t.Error("AddMetric() did not add metric to Metrics map")
-	}
-
-	// Test updating with higher frequency
-	err = AddMetric("test_metric", MetricConfig{
-		Frequency:   120,
-		Aggregation: SumAggregation,
-	})
-	if err != nil {
-		t.Errorf("AddMetric() error = %v", err)
-	}
-
-	if Metrics["test_metric"].Frequency != 120 {
-		t.Errorf("AddMetric() frequency = %d, want 120", Metrics["test_metric"].Frequency)
-	}
-
-	// Test updating with lower frequency (should not update)
-	err = AddMetric("test_metric", MetricConfig{
-		Frequency:   30,
-		Aggregation: SumAggregation,
-	})
-	if err != nil {
-		t.Errorf("AddMetric() error = %v", err)
-	}
-
-	if Metrics["test_metric"].Frequency != 120 {
-		t.Errorf("AddMetric() frequency = %d, want 120 (should not downgrade)", Metrics["test_metric"].Frequency)
-	}
-}
-
-func TestGetMetricFrequency(t *testing.T) {
-	// Reset Metrics before test
-	Metrics = map[string]MetricConfig{
-		"test_metric": {
-			Frequency:   60,
-			Aggregation: SumAggregation,
-		},
-	}
-
-	freq, err := GetMetricFrequency("test_metric")
-	if err != nil {
-		t.Errorf("GetMetricFrequency() error = %v", err)
-	}
-	if freq != 60 {
-		t.Errorf("GetMetricFrequency() = %d, want 60", freq)
-	}
-
-	_, err = GetMetricFrequency("nonexistent")
-	if err == nil {
-		t.Error("GetMetricFrequency() expected error for nonexistent metric")
-	}
-}
-
 func TestBufferWrite(t *testing.T) {
 	b := newBuffer(100, 10)