KIP-1073 — Return fenced brokers in DescribeCluster response

Accepted Kafka 4.0 KRaftAdmin

Extends `DescribeClusterRequest` (v2+) to optionally include fenced brokers in the response, adding an `includeFencedBrokers` option to `DescribeClusterOptions` and a `Fenced` field per broker in the response. When a KRaft broker node is removed without being unregistered, it stays fenced in the controller but is invisible to `DescribeCluster`, preventing operators from discovering the node ID needed to call the unregister API.

Protocol Impact

DescribeCluster v2

Details