updated monitoring playbooks
diff --git a/defaults/main.yml b/defaults/main.yml
index d530a95..dbaebab 100644
--- a/defaults/main.yml
+++ b/defaults/main.yml
@@ -176,7 +176,7 @@
 influxdb_system_port: 25826
 influxdb_port: 8086
 
-grafana_username: ''
+grafana_username: '{{ opdk_user_name }}'
 grafana_password: '{{ grafana_username }}'
 
 # Default collectd installation file