It will be nice to have the ListenerName available in AuthenticationContexts.
Since we can have multiple listeners using the same security protocol, this would allow to easily identify the origin of the connection in custom PrincipalBuilders rather than require to parse the IPs.
[KIP-282:Add the listener name to the authentication context|https://cwiki.apache.org/confluence/display/KAFKA/KIP-282%3A+Add+the+listener+name+to+the+authentication+context]
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