如何使用 client_golang 将指标推送到普罗米修斯？

Question

我还没有找到一些在 prometheus 中使用 Gauge、Counter 和 Histogram 的好例子。任何帮助都可以。我尝试使用文档，但未能成功创建可运行的应用程序。

Answer 1

Prometheus 是一个基于拉的系统，如果你想要基于推的监控，你需要使用某种网关。一个最小的例子（实际上没有做任何有用的事情，比如启动 HTTP 侦听器，或者实际上对指标做任何事情）如下：

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 以抓取您的二进制文件提供的 /metrics 页面。

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

您可以从 prometheus/client_golang 中找到示例。为了让你开始，你可以得到包：

$ 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推送网关地址来运行以下示例，在此示例中为 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

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

如何使用 client_golang 将指标推送到普罗米修斯？

How to push metrics to prometheus using client_golang?

go

prometheus