Add Prometheus alerts

Change-Id: Ia6873c44f4e5b179a6c4a545fbf4b45c978812ea
diff --git a/metadata/service/support.yml b/metadata/service/support.yml
index d85b94d..fb5051f 100644
--- a/metadata/service/support.yml
+++ b/metadata/service/support.yml
@@ -13,5 +13,7 @@
         enabled: true
       grafana:
         enabled: true
+      prometheus:
+        enabled: true
       telegraf:
         enabled: true