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58 lines
3.7 KiB
Markdown
58 lines
3.7 KiB
Markdown
# ClusterCockpit metrics
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As described in the [ClusterCockpit specifications](https://github.com/ClusterCockpit/cc-specifications), the whole ClusterCockpit stack uses metrics in the InfluxDB line protocol format. This is also the input and output format for the ClusterCockpit Metric Collector but internally it uses an extended format while processing, named CCMetric.
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It is basically a copy of the [InfluxDB line protocol](https://github.com/influxdata/line-protocol) `MutableMetric` interface with one extension. Besides the tags and fields, it contains a list of meta information (re-using the `Tag` structure of the original protocol):
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```golang
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type ccMetric struct {
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name string // Measurement name
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meta map[string]string // map of meta data tags
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tags map[string]string // map of of tags
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fields map[string]interface{} // map of of fields
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tm time.Time // timestamp
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}
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type CCMetric interface {
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ToPoint(metaAsTags map[string]bool) *write.Point // Generate influxDB point for data type ccMetric
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ToLineProtocol(metaAsTags map[string]bool) string // Generate influxDB line protocol for data type ccMetric
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String() string // Return line-protocol like string
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Name() string // Get metric name
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SetName(name string) // Set metric name
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Time() time.Time // Get timestamp
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SetTime(t time.Time) // Set timestamp
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Tags() map[string]string // Map of tags
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AddTag(key, value string) // Add a tag
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GetTag(key string) (value string, ok bool) // Get a tag by its key
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HasTag(key string) (ok bool) // Check if a tag key is present
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RemoveTag(key string) // Remove a tag by its key
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Meta() map[string]string // Map of meta data tags
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AddMeta(key, value string) // Add a meta data tag
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GetMeta(key string) (value string, ok bool) // Get a meta data tab addressed by its key
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HasMeta(key string) (ok bool) // Check if a meta data key is present
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RemoveMeta(key string) // Remove a meta data tag by its key
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Fields() map[string]interface{} // Map of fields
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AddField(key string, value interface{}) // Add a field
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GetField(key string) (value interface{}, ok bool) // Get a field addressed by its key
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HasField(key string) (ok bool) // Check if a field key is present
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RemoveField(key string) // Remove a field addressed by its key
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}
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func New(name string, tags map[string]string, meta map[string]string, fields map[string]interface{}, tm time.Time) (CCMetric, error)
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func FromMetric(other CCMetric) CCMetric
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func FromInfluxMetric(other lp.Metric) CCMetric
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```
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The `CCMetric` interface provides the same functions as the `MutableMetric` like `{Add, Get, Remove, Has}{Tag, Field}` and additionally provides `{Add, Get, Remove, Has}Meta`.
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The InfluxDB protocol creates a new metric with `influx.New(name, tags, fields, time)` while CCMetric uses `ccMetric.New(name, tags, meta, fields, time)` where `tags` and `meta` are both of type `map[string]string`.
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You can copy a CCMetric with `FromMetric(other CCMetric) CCMetric`. If you get an `influx.Metric` from a function, like the line protocol parser, you can use `FromInfluxMetric(other influx.Metric) CCMetric` to get a CCMetric out of it (see `NatsReceiver` for an example).
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Although the [cc-specifications](https://github.com/ClusterCockpit/cc-specifications/blob/master/interfaces/lineprotocol/README.md) defines that there is only a `value` field for the metric value, the CCMetric still can have multiple values similar to the InfluxDB line protocol.
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