Add Prometheus alerts

Change-Id: I6ebbebcf754db7aec82d3ee4ae87034d9ef267d4
diff --git a/metadata/service/support.yml b/metadata/service/support.yml
index 7b64df5..1bab20d 100644
--- a/metadata/service/support.yml
+++ b/metadata/service/support.yml
@@ -9,3 +9,5 @@
         enabled: false
       sphinx:
         enabled: false
+      prometheus:
+        enabled: true
\ No newline at end of file