Add Prometheus alert

Change-Id: Iff95c5a9c8fd2980ebf85a7db76e036bf1208ccc
diff --git a/metadata/service/support.yml b/metadata/service/support.yml
index 8e0ef24..23f1bcc 100644
--- a/metadata/service/support.yml
+++ b/metadata/service/support.yml
@@ -11,3 +11,5 @@
         enabled: true
       grafana:
         enabled: true
+      prometheus:
+        enabled: true
\ No newline at end of file