Kafka ListGroups Response Wire Format v0 — Binary Protocol Layout

What is ListGroups?

Enumerates all consumer groups known to a broker, used by kafka-consumer-groups.sh --list. Each broker only knows about groups it coordinates, so you must query all brokers for the complete picture (AdminClient does this automatically).

Schema
{
  "ErrorCode": int16,
  "Groups": [{
      "GroupId": string,
      "ProtocolType": string
  }]
}

Example
{
  "ErrorCode": 0,
  "Groups": [{
      "GroupId": "order-processors",
      "ProtocolType": "consumer"
  }]
}