XComp opened a new pull request #18846:
URL: https://github.com/apache/flink/pull/18846


   ## What is the purpose of the change
   
   Enables ZooKeeper `INFO` logs in test runs. I was wondering whether we 
should just create two log files: one with ZK logs enabled and one with ZK logs 
disabled. But I decided against it because it would generate a lot of redundant 
content. We can still match the logs through the timestamp
   
   ## Brief change log
   
   * Added new file appender and made it being used by the ZK-related loggers
   
   ## Verifying this change
   
   [Test run in 
AzureCI](https://dev.azure.com/mapohl/flink/_build/results?buildId=756&view=results)
 to verify that the logs are generated.
   
   ## Does this pull request potentially affect one of the following parts:
   
     - Dependencies (does it add or upgrade a dependency): no
     - The public API, i.e., is any changed class annotated with 
`@Public(Evolving)`: no
     - The serializers: no
     - The runtime per-record code paths (performance sensitive): no
     - Anything that affects deployment or recovery: JobManager (and its 
components), Checkpointing, Kubernetes/Yarn, ZooKeeper: no
     - The S3 file system connector: no
   
   ## Documentation
   
     - Does this pull request introduce a new feature? no
     - If yes, how is the feature documented? not applicable
   


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