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