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The reason is that we shall remove "ControllerNodeProvider" on the admin client, so that clients no longer have direct access towards the controller. Thus the active controller is properly isolated from the outside world, according to the KIP-631. To be more strict, the "ControllerId" field in MetadataResponse shall be set to -1 when the original request comes from a non-broker client. We shall use the request listener name to distinguish whether a given request is inter-broker, or from the client.

Protocol Bump

We also need to bump the Metadata RPC to v10 to propagate internal topic creation policy violation. Specifically:

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