Add support for prometheus

Add docker input

Change-Id: Ic8de00d37fecad5e6197f95f5852b60028688191
diff --git a/metadata/service/agent.yml b/metadata/service/agent.yml
index 5c6c2f6..c1501fe 100644
--- a/metadata/service/agent.yml
+++ b/metadata/service/agent.yml
@@ -1,5 +1,7 @@
 applications:
   - telegraf
+classes:
+ - service.telegraf.support
 parameters:
   telegraf:
     agent:
diff --git a/metadata/service/support.yml b/metadata/service/support.yml
new file mode 100644
index 0000000..a4b5e81
--- /dev/null
+++ b/metadata/service/support.yml
@@ -0,0 +1,5 @@
+parameters:
+  telegraf:
+    _support:
+      prometheus:
+        enabled: true