Move into api routers instead of main

services/entry/pkg/api/routers/metrics.go

@@ -0,0 +1,18 @@
+package routers
+
+import (
+	"github.com/gin-gonic/gin"
+	"github.com/prometheus/client_golang/prometheus/promhttp"
+)
+
+func metrics() gin.HandlerFunc {
+	h := promhttp.Handler()
+
+	return func(c *gin.Context) {
+		h.ServeHTTP(c.Writer, c.Request)
+	}
+}
+
+func metricsRouter(router *gin.Engine) {
+	router.GET("/metrics", metrics())
+}