This is a subtask of AMBARI-14384 "Ambari Metrics doesn't use SPNEGO to authenticate".
In a Kerberos enabled cluster with SPNEGO enabled on Hadoop APIs, Ambari Metrics Collector web-console will be Kerberos HTTP SPNEGO enabled too. But Ambari Metrics Monitor, a client of Ambari Metrics Collector, currently does not support Kerberos HTTP SPNEGO authentication.
2015-12-15 13:26:30,663 [INFO] emitter.py:101 - server: http://metrics-collector:6188/ws/v1/timeline/metrics
2015-12-15 13:26:30,671 [WARNING] emitter.py:84 - Error sending metrics to server. HTTP Error 401: Authentication required
2015-12-15 13:26:30,671 [WARNING] emitter.py:90 - Retrying after 5 ...