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39 lines
1018 B
39 lines
1018 B
package eventlog
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import (
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"github.com/go-kit/kit/metrics/prometheus"
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stdprometheus "github.com/prometheus/client_golang/prometheus"
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)
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// gauge is the subset of the Prometheus gauge interface used here.
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type gauge interface {
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Set(float64)
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}
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// Metrics define the metrics exported by the eventlog package.
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type Metrics struct {
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numItemsGauge gauge
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}
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// discard is a no-op implementation of the gauge interface.
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type discard struct{}
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func (discard) Set(float64) {}
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const eventlogSubsystem = "eventlog"
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// PrometheusMetrics returns a collection of eventlog metrics for Prometheus.
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func PrometheusMetrics(ns string, fields ...string) *Metrics {
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var labels []string
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for i := 0; i < len(fields); i += 2 {
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labels = append(labels, fields[i])
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}
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return &Metrics{
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numItemsGauge: prometheus.NewGaugeFrom(stdprometheus.GaugeOpts{
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Namespace: ns,
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Subsystem: eventlogSubsystem,
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Name: "num_items",
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Help: "Number of items currently resident in the event log.",
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}, labels).With(fields...),
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}
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}
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