Add docker prometheus alerts

Change-Id: I1fb242c2423d6823b0302c906bd14b882702b811
diff --git a/metadata/service/support.yml b/metadata/service/support.yml
index a90412e..a1c25d8 100644
--- a/metadata/service/support.yml
+++ b/metadata/service/support.yml
@@ -13,3 +13,5 @@
         enabled: false
       sphinx:
         enabled: true
+      prometheus:
+        enabled: true