48 lines
1.2 KiB
Go
48 lines
1.2 KiB
Go
// Package metrics implements Prometheus-compatible metrics for applications.
|
|
//
|
|
// This package is lightweight alternative to https://github.com/prometheus/client_golang
|
|
// with simpler API and smaller dependencies.
|
|
//
|
|
// Usage:
|
|
//
|
|
// 1. Register the required metrics via New* functions.
|
|
// 2. Expose them to `/metrics` page via WritePrometheus.
|
|
// 3. Update the registered metrics during application lifetime.
|
|
//
|
|
// The package has been extracted from https://victoriametrics.com/
|
|
package metrics
|
|
|
|
import (
|
|
"io"
|
|
)
|
|
|
|
type namedMetric struct {
|
|
name string
|
|
metric metric
|
|
}
|
|
|
|
type metric interface {
|
|
marshalTo(prefix string, w io.Writer)
|
|
}
|
|
|
|
var defaultSet = NewSet()
|
|
|
|
// WritePrometheus writes all the registered metrics in Prometheus format to w.
|
|
//
|
|
// If exposeProcessMetrics is true, then various `go_*` and `process_*` metrics
|
|
// are exposed for the current process.
|
|
//
|
|
// The WritePrometheus func is usually called inside "/metrics" handler:
|
|
//
|
|
// http.HandleFunc("/metrics", func(w http.ResponseWriter, req *http.Request) {
|
|
// metrics.WritePrometheus(w, true)
|
|
// })
|
|
//
|
|
func WritePrometheus(w io.Writer, exposeProcessMetrics bool) {
|
|
defaultSet.WritePrometheus(w)
|
|
if exposeProcessMetrics {
|
|
writeGoMetrics(w)
|
|
writeProcessMetrics(w)
|
|
}
|
|
}
|