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App Blacklisting - Blacklist metrics from one or more services. Other service metrics will be entirely allowed or controlled through a whitelist file.
```
ams-site : timeline.metrics.apps.blacklist = hbase,namenode
```
App Whitelisting - Whitelist metrics from one or more services.

     ams-site:timeline.metrics.apps.whitelist = nimbus,datanode

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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

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
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.
```

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