我正在想办法给普罗米修斯收集器加个标签。你知道我漏掉了什么吗？我有两个文件：主，去收集器，去
我使用以下链接作为指导。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。
对于标签，我尝试添加一个主机名，因此得到如下结果：

# HELP cmd_result Shows the cmd result
# TYPE cmd_result gauge
cmd_result{host="my_device_hostname"} 1.919256141363144e-76

我也是刚到golang，所以很有可能我的做法是完全错误的！我最终试图让prometheus在每次刮伤时都能得到cmd结果。

主频道，开始

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))
}

收藏家，开始

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)

}

func exeCmd(cmd string) float64 {
    parts := strings.Fields(cmd)
    out, err := exec.Command(parts[0], parts[1]).Output()
    if err != nil {
        fmt.Println("error occured")
        fmt.Printf("%s", err)
    }
    cmdProcessResult := Float64frombytes(out)
    return cmdProcessResult
}

func Float64frombytes(bytes []byte) float64 {
    bits := binary.LittleEndian.Uint64(bytes)
    float := math.Float64frombits(bits)
    return float
}