如何使用client_golang将指标推送到prometheus？

Question

我还没有找到一些在prometheus中使用Gauge,Counter和Histogram的好例子.对此有任何帮助.我尝试使用该文档,但我无法成功创建一个有用的应用程序.

Answer 1

您可以在prometheus/client_golang中找到示例。首先，您只需获取软件包即可：

$ go get github.com/prometheus/client_golang/prometheus
$ go get github.com/prometheus/client_golang/prometheus/push

您可以通过设置正确的pushgateway地址来运行以下示例，在本例中为http://localhost:9091/ ：

package main
import (
        "fmt"
        "github.com/prometheus/client_golang/prometheus"
        "github.com/prometheus/client_golang/prometheus/push"
)

func ExamplePusher_Push() {
        completionTime := prometheus.NewGauge(prometheus.GaugeOpts{
                Name: "db_backup_last_completion_timestamp_seconds",
                Help: "The timestamp of the last successful completion of a DB backup.",
        })
        completionTime.SetToCurrentTime()
        if err := push.New("http://localhost:9091/", "db_backup").
                Collector(completionTime).
                Grouping("db", "customers").
                Push(); err != nil {
                fmt.Println("Could not push completion time to Pushgateway:", err)
        }
}
func main() {
        ExamplePusher_Push()
}

运行你的脚本：

$ go run pushExample.go

运行代码后，您应该会在网关 ( http://localhost:9091/ )上看到指标。界面如下所示：

Answer 2

我找到了这个

`

package main

import (
    "net/http"

    "github.com/prometheus/client_golang/prometheus"
)

var (
cpuTemp = prometheus.NewGauge(prometheus.GaugeOpts{
    Name: "cpu_temperature_celsius",
    Help: "Current temperature of the CPU.",
 })
hdFailures = prometheus.NewCounter(prometheus.CounterOpts{
    Name: "hd_errors_total",
    Help: "Number of hard-disk errors.",
})
)

func init() {
    prometheus.MustRegister(cpuTemp)
    prometheus.MustRegister(hdFailures)
}

func main() {
    cpuTemp.Set(65.3)
    hdFailures.Inc()

    http.Handle("/metrics", prometheus.Handler())
    http.ListenAndServe(":8080", nil)
}

`

这可能对某些人有用.

Answer 3

Prometheus 是一个基于拉式的系统，如果您想要基于推式的监控，则需要使用某种网关。下面是一个最小的示例（没有实际执行任何有用的操作，例如启动 HTTP 侦听器，或实际对指标执行任何操作）：

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
}

然后，您需要配置 Prometheus 来抓取/metrics二进制文件提供的页面。