http://www.jishuchi.com/read/gin-practice/3839

http://t.zoukankan.com/guoxiangyue-p-11772717.html
https://blog.51cto.com/kaliarch/4921421
Prometheus+Grafana 安裝配置

var AccessCounter = prometheus.NewCounterVec(
    prometheus.CounterOpts{
        Name: "api_requests_total",
    },
    []string{"method", "path"},
)
func init() {
    prometheus.MustRegister(AccessCounter)
}
func main() {
    ...
    engine.GET("/counter", func(c *gin.Context) {
        purl, _ := url.Parse(c.Request.RequestURI)
        AccessCounter.With(prometheus.Labels{
            "method": c.Request.Method,
            "path":   purl.Path,
        }).Add(1)
    })
    engine.GET("/metrics", gin.WrapH(promhttp.Handler()))
    engine.Run(":10001")
}