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Prometheus 客户端

启动 Prometheus 客户端。

安装#

go get github.com/rookie-ninja/rk-boot/v2
go get github.com/rookie-ninja/rk-echo

Prometheus 选项#

名字 描述 类型 默认值
echo.prom.enabled 启动 prometheus boolean false
echo.prom.path Prometheus Web 路径 string /metrics
echo.prom.pusher.enabled 启动 prometheus pusher bool false
echo.prom.pusher.jobName JobName 将会以标签的形式添加到监控指标,并推送到远程 pushgateway string ""
echo.prom.pusher.remoteAddress Pushgateway 远程地址, http://x.x.x.x 或者 x.x.x.x string ""
echo.prom.pusher.intervalMs 推送间隔(毫秒) string 1000
echo.prom.pusher.basicAuth 远程 Pushgateway 的 Basic auth。 格式:[user:pass] string ""
echo.prom.pusher.certEntry rkentry.CertEntry 名称,请参考高级指南 string ""

快速开始#

1.创建 boot.yaml#

---
echo:
  - name: greeter
    port: 8080
    enabled: true
    prom:
      enabled: true                                        # Optional, default: false
#      path: ""                                            # Optional, default: "/metrics"
#      pusher:
#        enabled: false                                    # Optional, default: false
#        jobName: "greeter-pusher"                         # Required
#        remoteAddress: "localhost:9091"                   # Required
#        basicAuth: "user:pass"                            # Optional, default: ""
#        intervalMs: 10000                                 # Optional, default: 1000
#        certEntry: my-cert                                # Optional, default: "", reference of cert entry declared above

2.创建 main.go#

package main

import (
    "context"
    "github.com/rookie-ninja/rk-boot/v2"
    _ "github.com/rookie-ninja/rk-echo/boot"
)

// Application entrance.
func main() {
    // Create a new boot instance.
    boot := rkboot.NewBoot()

    // Bootstrap
    boot.Bootstrap(context.Background())

    // Wait for shutdown sig
    boot.WaitForShutdownSig(context.Background())
}

3.验证#

验证

http://localhost:8080/metrics

prom

Cheers#

4.Prometheus 客户端中添加监控#

我们需要先了解 Prometheus 中的如下概念。

prom

名字 详情
MetricsSet RK 自定义的结构,通过 MetricsSet 注册 Prometheus 的 Counter,Gauge,Histogram 和 Summary
Prometheus Registerer Prometheus 会通过 Registrerer 来管理 Counter,Gauge,Histogram 和 Summary
Prometheus Counter Counter 是一个累积度量,表示单个单调增加的计数器,其值只能增加或重置为零
Prometheus Gauge Gauge 值可以随意加减
Prometheus Histogram Histogram 进行采样(通常是请求持续时间或响应大小之类的内容)并将它们计算在可配置的桶中,同时还提供所有观测值的总和
Prometheus Summary 与 Histogram 类似,摘要样本观察(通常是请求持续时间和响应大小之类的东西)
Prometheus Namespace Prometheus 监控名格式: namespace_subSystem_metricsName
Prometheus SubSystem Prometheus 监控名格式: namespace_subSystem_metricsName
package main

import (
  "context"
  "fmt"
  "github.com/labstack/echo/v4"
  "github.com/rookie-ninja/rk-boot/v2"
  "github.com/rookie-ninja/rk-entry/v2/middleware/prom"
  "github.com/rookie-ninja/rk-echo/boot"
  "net/http"
)

// Application entrance.
func main() {
  // Create a new boot instance.
  boot := rkboot.NewBoot()

  // Register handler
  entry := rkecho.GetEchoEntry("greeter")

  set := rkmidprom.NewMetricsSet("rk", "demo", entry.PromEntry.Registerer)

  // Register counter, gauge, histogram, summary
  set.RegisterCounter("my_counter", "label")
  set.RegisterGauge("my_gauge", "label")
  set.RegisterHistogram("my_histogram", []float64{}, "label")
  set.RegisterSummary("my_summary", rkmidprom.SummaryObjectives, "label")

  // Increase counter, gauge, histogram, summary with label value
  set.GetCounterWithValues("my_counter", "value").Inc()
  set.GetGaugeWithValues("my_gauge", "value").Add(1.0)
  set.GetHistogramWithValues("my_histogram", "value").Observe(0.1)
  set.GetSummaryWithValues("my_summary", "value").Observe(0.1)

  // Bootstrap
  boot.Bootstrap(context.TODO())

  boot.WaitForShutdownSig(context.TODO())
}

5.验证#

验证

http://localhost:8080/metrics

prom

Cheers#

6.推送到 Pushgateway#

在 boot.yaml 中启动 pusher。

---
echo:
  - name: greeter
    port: 8080
    enabled: true
    prom:
      enabled: true                         # Optional, default: false
      pusher:
        enabled : true                      # Optional, default: false
        jobName: "demo"                     # Required
        remoteAddress: "localhost:9091"     # Required
        intervalMs: 2000                    # Optional, default: 1000
#        certEntry: my-cert                 # Optional, default: "", reference of cert entry declared above

在本地启动 pushgateway

$ docker run -p 9091:9091 prom/pushgateway

在本地 pushgateway 中验证

http://localhost:9091

pushgateway

Cheers#

r