Add prometheus, alertmanager, pushgateway configs

Change-Id: I7f146e0207ada58f0723b14d0a625a6bce67ea9f
diff --git a/metadata/service/support.yml b/metadata/service/support.yml
new file mode 100644
index 0000000..76476fd
--- /dev/null
+++ b/metadata/service/support.yml
@@ -0,0 +1,5 @@
+parameters:
+  prometheus:
+    _support:
+      grafana:
+        enabled: true