FrankYang0529 commented on PR #19191:
URL: https://github.com/apache/kafka/pull/19191#issuecomment-2967223454

   In my testing, only `controller.listener.names` cannot be lowercase. Other 
fields like `listeners`, `advertised.listeners`, and 
`listener.security.protocol.map` can accept lowercase controller listener name. 
If we don't want to change the behavior, I recommend to add validation to 
KafkaConfig, so users don't get unclear message like following. 
   
   ```
   requirement failed: The listeners config must only contain KRaft controller 
listeners from controller.listener.names when process.roles=controller
   ```
   
   They should get clear message like:
   ```
   requirement failed: controller.listener.names doesn't allow lowercase
   ```


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