Function main

examples/createdtimestamps/main.go:27–60

()

)

func main() {
	requestDurations := prometheus.NewHistogram(prometheus.HistogramOpts{
		Name:    "http_request_duration_seconds",
		Help:    "A histogram of the HTTP request durations in seconds.",
		Buckets: prometheus.ExponentialBuckets(0.1, 1.5, 5),
	})

	// Create non-global registry.
	registry := prometheus.NewRegistry()
	registry.MustRegister(
		requestDurations,
	)

	go func() {
		for {
			// Record fictional latency.
			now := time.Now()
			requestDurations.Observe(time.Since(now).Seconds())
			time.Sleep(600 * time.Millisecond)
		}
	}()

	// Expose /metrics HTTP endpoint using the created custom registry.
	http.Handle(
		"/metrics", promhttp.HandlerFor(
			registry,
			promhttp.HandlerOpts{
				EnableOpenMetrics:                   true,
				EnableOpenMetricsTextCreatedSamples: true,
			}),
	)
	// To test: curl -H 'Accept: application/openmetrics-text' localhost:8080/metrics
	log.Fatalln(http.ListenAndServe(":8080", nil))
}