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Currently when building a Principal, the builder has access to an AuthenticationContext which contains the security protocol as well as the client address. However since 0.10.2.0 Kafka can have multiple listeners for the same security protocol using listener names (listener.security.protocol.map). While we can identify the source of the connection using the client address, having the listener name would make it simpler as IPs/networks can change and it currently requires to parse the client IP.

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