Use salt support to generate grains

Change-Id: I7cc5f00608127e0bf4df5bbd58db4cae9816a402
diff --git a/metadata/service/collector.yml b/metadata/service/collector.yml
new file mode 100644
index 0000000..03f8ecc
--- /dev/null
+++ b/metadata/service/collector.yml
@@ -0,0 +1,6 @@
+applications:
+  - prometheus
+parameters:
+  prometheus:
+    collector:
+      enabled: true