如何使用gin作为服务器编写prometheus导出器指标
这是 prometheus golang-client 的官方例子吗？
package main
import (
"log"
"net/http"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/promhttp"
)
var cpuTemp = prometheus.NewGauge(prometheus.GaugeOpts{
Name: "cpu_temperature_celsius",
Help: "Current temperature of the CPU.",
})
func init() {
// Metrics have to be registered to be exposed:
prometheus.MustRegister(cpuTemp)
}
func main() {
cpuTemp.Set(65.3)
// The Handler function provides a default handler to expose metrics
// via an HTTP server. "/metrics" is the usual endpoint for that.
http.Handle("/metrics", promhttp.Handler())
log.Fatal(http.ListenAndServe(":8080", nil))
}
在此代码中，http 服务器使用该promhttp库。
使用gin框架时如何修改指标处理程序？我没有在文档中找到答案。
回答
我们只是利用promhttp处理程序。
package main
import (
"github.com/gin-gonic/gin"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/promhttp"
)
var cpuTemp = prometheus.NewGauge(prometheus.GaugeOpts{
Name: "cpu_temperature_celsius",
Help: "Current temperature of the CPU.",
})
func init() {
prometheus.MustRegister(cpuTemp)
}
func prometheusHandler() gin.HandlerFunc {
h := promhttp.Handler()
return func(c *gin.Context) {
h.ServeHTTP(c.Writer, c.Request)
}
}
func main() {
cpuTemp.Set(65.3)
r := gin.New()
r.GET("/", func(c *gin.Context) {
c.JSON(200, "Hello world!")
})
r.GET("/metrics", prometheusHandler())
r.Run()
}
或者我们总是可以切换到 Prometheus 中间件 - https://github.com/zsais/go-gin-prometheus