metrics_generator.go

package main

import (
	"github.com/VictoriaMetrics/metrics"
	"net/http"
	"time"
)

var (
	fooHistogram = metrics.NewHistogram(`test_histogram_seconds{label_1="foo"}`)
	barHistogram = metrics.NewHistogram(`test_histogram_seconds{label_1="bar"}`)
)

func main() {
	for i := 0; i < 4; i++ {
		go func() {
			for {
				fooHistogram.Update(1)
				barHistogram.Update(2)
				time.Sleep(10 * time.Millisecond)
			}
		}()
	}

	http.HandleFunc("/metrics", func(w http.ResponseWriter, req *http.Request) {
		metrics.WritePrometheus(w, true)
	})
	http.ListenAndServe(":2112", nil)
}