Add Telegraf support

Change-Id: I555974d19c7b8cb48f2334551a202f1cc0885f72
diff --git a/metadata/service/support.yml b/metadata/service/support.yml
index 1ee587a..3f37b10 100644
--- a/metadata/service/support.yml
+++ b/metadata/service/support.yml
@@ -3,6 +3,8 @@
     _support:
       collectd:
         enabled: true
+      telegraf:
+        enabled: true
       heka:
         enabled: true
       sensu: