为 golang prometheus 收集器添加标签

Question

我想弄清楚如何向普罗米修斯收集器添加标签。任何想法我在这里缺少什么？我有两个文件：main.go 和 collector.go

我使用以下链接作为指南。https://rsmitty.github.io/Prometheus-Exporters/

我模拟了这个例子，所以我可以把它贴在这里。我最终不会为命令提取“date +%s”。只是不知道在哪里添加标签。

对于我正在尝试添加主机名的标签，结果如下：

# HELP cmd_result Shows the cmd result

# TYPE cmd_result gauge

cmd_result{host="my_device_hostname"} 1.919256141363144e-76

我对 golang 也很陌生，所以我很有可能把这一切都弄错了！我最终试图让普罗米修斯在每次刮擦时拉出 cmd 结果。

主程序

package main

import (

    "net/http"

    log "github.com/Sirupsen/logrus"

    "github.com/prometheus/client_golang/prometheus"

    "github.com/prometheus/client_golang/prometheus/promhttp"

)

func main() {

    //Create a new instance of the collector and

    //register it with the prometheus client.

    cmd := newCollector()

    prometheus.MustRegister(cmd)

    //This section will start the HTTP server and expose

    //any metrics on the /metrics endpoint.

    http.Handle("/metrics", promhttp.Handler())

    log.Info("Beginning to serve on port :8080")

    log.Fatal(http.ListenAndServe(":8080", nil))

}

收集器.go

package main

import (

    "encoding/binary"

    "fmt"

    "math"

    "os/exec"

    "strings"

    "github.com/prometheus/client_golang/prometheus"

)

type cmdCollector struct {

    cmdMetric *prometheus.Desc

}

func newCollector() *cmdCollector {

    return &cmdCollector{

        cmdMetric: prometheus.NewDesc("cmd_result",

            "Shows the cmd result",

            nil, nil,

        ),

    }

}

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

    ch <- collector.cmdMetric

}

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

    var metricValue float64

    command := string("date +%s")

    cmdResult := exeCmd(command)

    metricValue = cmdResult

    ch <- prometheus.MustNewConstMetric(collector.cmdMetric, prometheus.GaugeValue, metricValue)

}

Answer 1

我想到了。我必须在调用 NewDesc 方法的地方声明标签，然后在 MustNewConstMetric 方法中传递值这是带有“主机名”标签的新“newCollector”。func newCollector() *cmdCollector {    return &cmdCollector{        cmdMetric: prometheus.NewDesc("cmd_result",            "Shows the cmd result",            []string{"hostname"}, nil,        ),    }}值得注意的是，我只是在这里添加“变量标签”。最后一个 'nil' 用于常量标签。您可以像这样添加任意数量的项目...[]string{"hostname", "another_label", "and_another_label"}这在此处介绍： https ://godoc.org/github.com/prometheus/client_golang/prometheus#NewDesc接下来，我可以在调用“MustNewConstMetric”方法时添加这些值。ch <- prometheus.MustNewConstMetric(collector.cmdMetric, prometheus.GaugeValue, metricValue, hostname)整个街区...func (collector *cmdCollector) Collect(ch chan<- prometheus.Metric) {    var metricValue float64    command := string("date +%s")    cmdResult := exeCmd(command)    metricValue = cmdResult    ch <- prometheus.MustNewConstMetric(collector.cmdMetric, prometheus.GaugeValue, metricValue, hostname)}如果我传入多个标签；比如我上面的例子，它看起来更像这样......ch <- prometheus.MustNewConstMetric(collector.cmdMetric, prometheus.GaugeValue, metricValue, hostname, anotherLabel", "andAnotherLabel)