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• If you just have timeline.metrics.whitelist.file = <some_file>, only metrics in that file will be allowed (irrespective of whatever apps might be sending them). 
• If you just have timeline.metrics.apps.blacklist = datanode, all datanode metrics will be disallowed. Metrics from all other services will be allowed.
• If you just have timeline.metrics.apps.whitelist = namenode, it is not useful since there is no blacklisting at all. 
• If you have metric whitelisting enabled (through a file), and have timeline.metrics.apps.blacklist = datanode, all datanode metrics will be disallowed. The whitelisted metrics from other services will be allowed.
• If you have timeline.metrics.apps.blacklist = datanode, timeline.metrics.apps.whitelist = namenode and metric whitelisting enabled (through a file), datanode metrics will be blacklisted, all namenode metrics will be allowed, and whitelisted metrics from other services will be allowed.

Known Issues

1. Jira
   server ASF JIRA serverId 5aa69414-a9e9-3523-82ec-879b028fb15b key AMBARI-25383

   The Kafka Topics Grafana dashboard is unable to discover the Kafka Topics by default if whitelisting is enabled. The reason is that 'kafka.log.Log.*' metrics are used to filter the available Kafka Topics but those metrics are not enabled by default in the whitelist file. The issue can be remediated by adding '._p_kafka.log.Log.*' to the whitelist file and restarting the Metrics Collector.
   

   Jira
   server ASF JIRA serverId 5aa69414-a9e9-3523-82ec-879b028fb15b key AMBARI-25383

   
   
2. The following metrics are erroneously filtered by the whitelisting despite they are defined whitelist file. Due to this issue the Kafka Topics Grafana dashboard is not showing data.kafka.server.BrokerTopicMetrics.BytesInPerSec.topic.*.count
   kafka.server.BrokerTopicMetrics.BytesOutPerSec.topic.*.count
   kafka.server.BrokerTopicMetrics.MessagesInPerSec.topic.*.count
   kafka.server.BrokerTopicMetrics.TotalProduceRequestsPerSec.topic.*.countThe issue can be worked around by adding the '._p_' prefix to the corresponding metrics in the whitelist file, e.g.

   ._p_kafka.server.BrokerTopicMetrics.BytesInPerSec.topic.*.count .

   Jira
   server ASF JIRA serverId 5aa69414-a9e9-3523-82ec-879b028fb15b key AMBARI-25383