如何使用client_golang将指标推送到Prometheus？

Question

I have not yet able to find some good examples in using Gauge, Counter and Histogram in prometheus. Any help on this will do. I tried using the the documentation but I was not able to successfully create a working app.

Answer 1

Prometheus is a pull-based system, if you want push-based monitoring, you need to use a gateway of some sort. A minimal example (without actually doing anything useful like starting an HTTP listener, or actually doing anything to a metric) follows:

import (
        "github.com/prometheus/client_golang/prometheus"
        "net/http"
)

var responseMetric = prometheus.NewHistogram(
        prometheus.HistogramOpts{
                Name: "request_duration_milliseconds",
                Help: "Request latency distribution",
                Buckets: prometheus.ExponentialBuckets(10.0, 1.13, 40),
        })

func main() {
        prometheus.MustRegister(responseMetric)
        http.Handle("/metrics", prometheus.Handler())
        // Any other setup, then an http.ListenAndServe here
}

You then need to configure Prometheus to scrape the /metrics page your binary provides.