Enable Prometheus support

This change adds alerts on API status and log metrics.

Change-Id: I443c128ead4d33c4e2887034bdebd09dcd8837b4
diff --git a/metadata/service/support.yml b/metadata/service/support.yml
index 27889ff..e39cbbd 100644
--- a/metadata/service/support.yml
+++ b/metadata/service/support.yml
@@ -15,3 +15,5 @@
         enabled: true
       telegraf:
         enabled: true
+      prometheus:
+        enabled: true