Add Prometheus alerts

Change-Id: I9b6890d0fe727c145f5002a48e73d93ce6e6f9dc
diff --git a/metadata/service/support.yml b/metadata/service/support.yml
index 005b24e..5146360 100644
--- a/metadata/service/support.yml
+++ b/metadata/service/support.yml
@@ -13,3 +13,5 @@
         enabled: true
       telegraf:
         enabled: true
+      prometheus:
+        enabled: true