Add support for Grafana

This patch enables support for Grafana and provides a new dashboard.
diff --git a/metadata/service/support.yml b/metadata/service/support.yml
index 96add0a..9da35f9 100644
--- a/metadata/service/support.yml
+++ b/metadata/service/support.yml
@@ -11,3 +11,5 @@
         enabled: true
       config:
         enabled: true
+      grafana:
+        enabled: true