Thomas Gruber f6dae7c013
Derived metrics (#57)
* Add time-based derivatived (e.g. bandwidth) to some collectors

* Add documentation

* Add comments

* Fix: Only compute rates with a valid previous state

* Only compute rates with a valid previous state

* Define const values for net/dev fields

* Set default config values

* Add comments

* Refactor: Consolidate data structures

* Refactor: Consolidate data structures

* Refactor: Avoid struct deep copy

* Refactor: Avoid redundant tag maps

* Refactor: Use int64 type for absolut values

Co-authored-by: Holger Obermaier <40787752+ho-ob@users.noreply.github.com>
2022-03-11 13:48:18 +01:00
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CCMetric collectors

This folder contains the collectors for the cc-metric-collector.

Configuration

{
    "collector_type" : {
        <collector specific configuration>
    }
}

In contrast to the configuration files for sinks and receivers, the collectors configuration is not a list but a set of dicts. This is required because we didn't manage to partially read the type before loading the remaining configuration. We are eager to change this to the same format.

Available collectors

Todos

  • Aggreate metrics to higher topology entity (sum hwthread metrics to socket metric, ...). Needs to be configurable

Contributing own collectors

A collector reads data from any source, parses it to metrics and submits these metrics to the metric-collector. A collector provides three function:

  • Name() string: Return the name of the collector
  • Init(config json.RawMessage) error: Initializes the collector using the given collector-specific config in JSON. Check if needed files/commands exists, ...
  • Initialized() bool: Check if a collector is successfully initialized
  • Read(duration time.Duration, output chan ccMetric.CCMetric): Read, parse and submit data to the output channel as CCMetric. If the collector has to measure anything for some duration, use the provided function argument duration.
  • Close(): Closes down the collector.

It is recommanded to call setup() in the Init() function.

Finally, the collector needs to be registered in the collectorManager.go. There is a list of collectors called AvailableCollectors which is a map (collector_type_string -> pointer to MetricCollector interface). Add a new entry with a descriptive name and the new collector.

Sample collector

package collectors

import (
    "encoding/json"
    "time"

    lp "github.com/ClusterCockpit/cc-metric-collector/internal/ccMetric"
)

// Struct for the collector-specific JSON config
type SampleCollectorConfig struct {
    ExcludeMetrics []string `json:"exclude_metrics"`
}

type SampleCollector struct {
    metricCollector
    config SampleCollectorConfig
}

func (m *SampleCollector) Init(config json.RawMessage) error {
    // Check if already initialized
    if m.init {
        return nil
    }

    m.name = "SampleCollector"
    m.setup()
    if len(config) > 0 {
        err := json.Unmarshal(config, &m.config)
        if err != nil {
            return err
        }
    }
    m.meta = map[string]string{"source": m.name, "group": "Sample"}

    m.init = true
    return nil
}

func (m *SampleCollector) Read(interval time.Duration, output chan lp.CCMetric) {
    if !m.init {
        return
    }
    // tags for the metric, if type != node use proper type and type-id
    tags := map[string]string{"type" : "node"}

    x, err := GetMetric()
    if err != nil {
        cclog.ComponentError(m.name, fmt.Sprintf("Read(): %v", err))
    }

    // Each metric has exactly one field: value !
    value := map[string]interface{}{"value": int64(x)}
    if y, err := lp.New("sample_metric", tags, m.meta, value, time.Now()); err == nil {
        output <- y
    }
}

func (m *SampleCollector) Close() {
    m.init = false
    return
}