Add Prometheus alerts

Change-Id: I52a57929f2f3876062f22900ee228a3d6d2e4bf3
diff --git a/metadata/service/support.yml b/metadata/service/support.yml
index d245299..e5afb0d 100644
--- a/metadata/service/support.yml
+++ b/metadata/service/support.yml
@@ -11,3 +11,5 @@
         enabled: true
       telegraf:
         enabled: true
+      prometheus:
+        enabled: true