如何在 golang 中将直方图添加到 prometheus 导出器？

Posted 2023-02-16

【中文标题】如何在 golang 中将直方图添加到 prometheus 导出器？

【英文标题】：How do I add histogram to prometheus exporter in golang?

【发布时间】：2021-11-28 22:25:32

【问题描述】：

这是我的代码示例。现在我想在我的代码中添加直方图。 但我找不到像这样添加直方图的方法。

有人可以帮我吗？ 我可以编写直方图示例，但无法在下面的代码中添加它

package main
import (
    "github.com/prometheus/client_golang/prometheus"
    "github.com/prometheus/client_golang/prometheus/promhttp"
    "github.com/prometheus/common/log"
    "net/http"
)

type fooCollector struct 
    fooMetric *prometheus.Desc


func newFooCollector(label1 string) *fooCollector 
    return &fooCollector
        fooMetric: prometheus.NewDesc("fff_metric",
            "Shows whether a foo has occurred in our cluster",
            nil, prometheus.Labels"env":label1,
        ),
        
    


func (collector *fooCollector) Describe(ch chan<- *prometheus.Desc) 

    //Update this section with the each metric you create for a given collector
    ch <- collector.fooMetric


func (collector *fooCollector) Collect(ch chan<- prometheus.Metric) 

    ch <- prometheus.MustNewConstMetric(collector.fooMetric, prometheus.GaugeValue, 111111)


func main() 
    prometheus.MustRegister(newFooCollector("dev"))
    http.Handle("/metrics", promhttp.Handler())
    http.ListenAndServe(":80", nil)

【参考方案1】：

我终于学会了直方图的工作原理。这是我的代码

package main

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

type fooCollector struct 
    fooMetric *prometheus.Desc

//First,we define the variable of histogram
var (
    hbrms_histovec = prometheus.NewHistogramVec(
        prometheus.HistogramOpts
            Name:        "hbrms_histogram",
            Help:        "hbrms_histogram",
            ConstLabels: prometheus.Labels"constname": "constvalue",
            Buckets: prometheus.ExponentialBuckets(50, 1.3, 15),//50*1.3,15times
        ,
        []string"env",
    )

)

func newFooCollector() *fooCollector 
    return &fooCollector
        fooMetric: prometheus.NewDesc("fff_metric",
            "Shows whether a foo has occurred in our cluster",
            nil, nil,
        ),
    


func (collector *fooCollector) Describe(ch chan<- *prometheus.Desc) 
    ch <- collector.fooMetric


func (collector *fooCollector) Collect(ch chan<- prometheus.Metric) 
    ch <- prometheus.MustNewConstMetric(collector.fooMetric, prometheus.CounterValue, float64(1))
    // 2nd,we set metrics in this way instead of write to channel,we just find a way of calling the code below when we visit the url.
    hbrms_histovec.WithLabelValues("val1").Observe(float64(10))


func main() 
    reg := prometheus.NewPedanticRegistry()
    reg.MustRegister(newFooCollector())
    // finally,we register the metrics "hbrms_histovec" in this way
    reg.MustRegister(hbrms_histovec)
    gatherers := prometheus.Gatherersreg

    h := promhttp.HandlerFor(gatherers,
        promhttp.HandlerOpts
            ErrorHandling: promhttp.ContinueOnError,
        )

    http.HandleFunc("/metrics", func(w http.ResponseWriter, r *http.Request) 
        h.ServeHTTP(w, r)
    )
    http.ListenAndServe(":80", nil)