Kafka DescribeQuorum Request Wire Format v2 — Binary Protocol Layout

What is DescribeQuorum?

Shows KRaft controller quorum health via kafka-metadata-quorum.sh --describe. The lagOffset per voter reveals how far behind each follower controller is from the leader. A voter with high lag and not in the ISR may be unable to participate in elections.

Schema
{
  "Topics": [{
      "TopicName": string,
      "Partitions": [{
          "PartitionIndex": int32
      }]
  }]
}

Example
{
  "Topics": [{
      "TopicName": "orders",
      "Partitions": [{
          "PartitionIndex": 3
      }]
  }]
}