Add Prometheus alerts

Change-Id: I80b43221d39048cf2268b59e8b9cd70f2b693b78
diff --git a/metadata/service/support.yml b/metadata/service/support.yml
index 3a18832..3895e61 100644
--- a/metadata/service/support.yml
+++ b/metadata/service/support.yml
@@ -15,3 +15,5 @@
         enabled: true
       telegraf:
         enabled: true
+      prometheus:
+        enabled: true