WHAT

Currently, there are some kafka logs in TRACE level, and some are WARN and some are OFF. We need to revisit them to make sure the log level is set appropriately.
https://github.com/bf2fc6cc711aee1a0c2a/kas-fleetshard/blame/main/operator/src/main/resources/kafka-logging.yaml#L35

WHY

Too many logs (i.e. TRACE level) will cost more storage and also have performance impact. But on the other hands, if they can provide helpful info, it'll help a lot during troubleshooting.

DONE

Define the appropriate kafka log level for managed kafka instances