[DISCUSS] KIP-1143: Deprecated Optional and return String from public Endpoint#listenerName

[PoAn Yang]

Hi all,

I would like to start a discussion thread on KIP-1143.

This KIP removes redundant org.apache.kafka.network.EndPoint and replaces it 
with org.apache.kafka.common.Endpoint. Also, it changes output of 
Endpoint#listenerName from Optional<String> to String.

Please take a look and feel free to share any thoughts.

https://cwiki.apache.org/confluence/pages/viewpage.action?pageId=345377327

Sample PR: https://github.com/apache/kafka/pull/19191

Thanks,
PoAn