Add keepalived prometheus alerts

Change-Id: I36214cf36135ceb7300048f49b4c4d617614657a
diff --git a/metadata/service/support.yml b/metadata/service/support.yml
index 90d9649..989b10b 100644
--- a/metadata/service/support.yml
+++ b/metadata/service/support.yml
@@ -11,3 +11,5 @@
         enabled: true
       telegraf:
         enabled: true
+      prometheus:
+        enabled: true