[VOL-3255] enhancement to support device metrics

Change-Id: Ic26c2db30a58943a4eef6276ae1cf40350d51702
diff --git a/config/conf.yaml b/config/conf.yaml
index a1ec3fa..4e299aa 100644
--- a/config/conf.yaml
+++ b/config/conf.yaml
@@ -9,6 +9,7 @@
     - onos.aaa.stats.kpis
     - bng.stats
     - voltha.events
+    - dm.metrics
 logger:
   loglevel: debug
   host: cord-kafka.default.svc.cluster.local:9092