Adds dummy prom metrics for alerting

control.go

@@ -68,6 +68,7 @@ func NewController(conf Config, mprof, pprof, staticFiles string) *http.ServeMux
 		"bandwidth": "/api/v0/game/bw/",
 		"fsu":       "/api/v0/fsu/",
 		"info":      "/api/v0/info/",
+		"metrics":   "/metrics",
 	}
 
 	sm := http.NewServeMux()
@@ -108,6 +109,9 @@ func NewController(conf Config, mprof, pprof, staticFiles string) *http.ServeMux
 	sm.Handle(prefix["bandwidth"], JsonHandler(c.BW))
 	sm.HandleFunc(prefix["fsu"], c.KillServer)
 	sm.HandleFunc(prefix["info"], c.Info)
+	sm.HandleFunc(prefix["metrics"], func(w http.ResponseWriter, req *http.Request) {
+		fmt.Fprintf(w, "up 1\n")
+	})
 
 	return sm
 }