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 43a86c4..cb2f13a 100644
--- a/metadata/service/support.yml
+++ b/metadata/service/support.yml
@@ -12,4 +12,6 @@
       iptables:
         enabled: true
       config:
-        enabled: true
\ No newline at end of file
+        enabled: true
+      grafana:
+        enabled: true