added prometheus route

main.go

@@ -11,6 +11,7 @@ import (
 
 	"github.com/elazarl/go-bindata-assetfs"
 	"github.com/gorilla/sessions"
+	"github.com/prometheus/client_golang/prometheus"
 )
 
 //go:generate go-bindata -o static.go static/
@@ -24,6 +25,7 @@ var store = sessions.NewCookieStore([]byte(os.Getenv("MMG_SECRET_KEY")))
 func main() {
 	rand.Seed(time.Now().UTC().UnixNano())
 	flag.Parse()
+	http.Handle("/metrics", prometheus.Handler())
 	http.HandleFunc("/api/v0/addsub/problem/", addsub)
 	http.HandleFunc("/api/v0/mul/problem/", mul)
 	http.HandleFunc("/api/v0/attempt/", attempt)