[som] fix ts_mon housekeeping/routing

go/src/infra/appengine/sheriff-o-matic/main.go

Index: go/src/infra/appengine/sheriff-o-matic/main.go
diff --git a/go/src/infra/appengine/sheriff-o-matic/main.go b/go/src/infra/appengine/sheriff-o-matic/main.go
index 8bf25a6e843526f38d0ffd6e620d0e2608736b4b..7c6a947609f90546112e0be1b5535c780c9043d1 100644
--- a/go/src/infra/appengine/sheriff-o-matic/main.go
+++ b/go/src/infra/appengine/sheriff-o-matic/main.go
@@ -574,6 +574,7 @@ func base() router.MiddlewareChain {
 
 //// Routes.
 func init() {
+
 	settings.RegisterUIPage(settingsKey, settingsUIPage{})
 
 	r := router.New()
@@ -596,5 +597,7 @@ func init() {
 	http.DefaultServeMux.Handle("/admin/", r)
 	http.DefaultServeMux.Handle("/auth/", r)
 	http.DefaultServeMux.Handle("/_ah/", r)
+	http.DefaultServeMux.Handle("/internal/", r)
+
 	http.DefaultServeMux.Handle("/", rootRouter)
 }