Add Prometheus alerts

Change-Id: Ic0b11e541fb8d40aed9317867d4c05084a6cbfa4
diff --git a/metadata/service/support.yml b/metadata/service/support.yml
index b17f605..8430304 100644
--- a/metadata/service/support.yml
+++ b/metadata/service/support.yml
@@ -17,3 +17,5 @@
         enabled: true
       telegraf:
         enabled: true
+      prometheus:
+        enabled: true