Enable Prometheus scraping metrics from Grafana metrics endpoint

Change-Id: Iefa86330cc9f23f7453a79979a8c34adab36a411
Related-Bug: PROD-18204
diff --git a/metadata/service/support.yml b/metadata/service/support.yml
index 3bd2dd1..6437621 100644
--- a/metadata/service/support.yml
+++ b/metadata/service/support.yml
@@ -11,3 +11,5 @@
         enabled: true
       grafana:
         enabled: true
+      prometheus:
+        enabled: true