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kafka-cluster unregister-controller  is a command for users when they want to unregister a controller from the cluster. This command should only be run after a controller is stopped, and the operator does not intend to bring it back. kafka-cluster unregister-controller  works irrespective of the quorum mode. 

This command supports unregistering any controller registration in any quorum mode, such as:

• Any voter in a dynamic quorum
• Any observer in a dynamic quorum
• Any stale "voter" in a static quorum as a result of a misconfiguration of controller.quorum.voters 

In any of these cases, it is expected that the controller process has stopped before the operator unregisters it via these tools. If the controller process has not stopped, it will attempt to re-register with the cluster.

kafka-metadata-quorum 

Add the --unregister flag to the kafka-metadata-quorum remove-controller command. When this flag is set, invoking this command with --unregister set will remove the controller as a KRaft voter and unregister it. Below is an example invocation.

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