chia7712 commented on PR #20405:
URL: https://github.com/apache/kafka/pull/20405#issuecomment-3221510808

   > Thanks for the feedback. I'm still working on adding the test case and 
will update the PR once it's ready.
   
   Perhaps we could enhance 
`testServersCanStartWithInvalidStaticConfigsAndValidDynamicConfigs` to cover 
this case.
   
   1. add a custom `MetricsReporter` to the `newBroker`. the `MetricsReporter` 
must rely on a dynamic server configuration, such as `num.replica.fetchers`
   2. add `num.replica.fetchers` to the cluster-level config 
   3. if `readDynamicBrokerConfigsFromSnapshot` works correctly,  the custom 
`MetricsReporter` should not be reconfigured after a restart.


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