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{
  "apiKey": TBD,
  "type": "request",
  "listeners": ["zkBroker", "broker"],
  "name": "ConsumerGroupHeartbeatRequest",
  "validVersions": "0",
  "flexibleVersions": "0+",
  "fields": [
    { "name": "GroupId", "type": "string", "versions": "0+", "entityType": "groupId",
      "about": "The group identifier." },
    { "name": "MemberId", "type": "uuid", "versions": "0+",
      "about": "The member id generated by the client." },
    { "name": "MemberEpoch", "type": "int32", "versions": "0+", "default": "-1",
      "about": "The current member epoch; 0 to join the group; -1 to leave the group." },
    { "name": "InstanceId", "type": "string", "versions": "0+", "nullableVersions": "0+", "default": "null",
      "about": "null it not provided or if it didn't change since the last heartbeat; the instance Id otherwise." },
    { "name": "RebalanceTimeoutMs", "type": "int32", "versions": "0+", "default": -1,
      "about": "-1 if it didn't chance since the last heartbeat; the maximum time in milliseconds that
                the coordinator will wait on the member to revoke its partitions otherwise." },
    { "name": "SubscribedTopicNames", "type": "[]string", "versions": "0+", "nullableVersions": "0+", "default": "null",
      "about": "null if it didn't change since the last heartbeat; the subscribed topic names otherwise." },
    { "name": "SubscribedTopicRegex", "type": "string", "versions": "0+", "nullableVersions": "0+", "default": "null",
      "about": "null if it didn't change since the last heartbeat; the subscribed topic regex otherwise" },
    { "name": "ServerAssignor", "type": "string", "versions": "0+", "nullableVersions": "0+", "default": "null",
      "about": "null if not used or if it didn't change since the last heartbeat; the server side assignor to use otherwise." }, 
    { "name": "ClientAssignors", "type": "[]Assignor", "versions": "0+", "nullableVersions": "0+", "default": "null",
      "about": "null if not used or if it didn't change since the last heartbeat; the list of client-side assignors otherwise.",
      "fields": [
        { "name": "Name", "type": "string", "versions": "0+",
          "about": "The name of the assignor." },
        { "name": "MinimumVersion", "type": "int32", "versions": "0+",
          "about": "The minimum supported version for the metadata." },
        { "name": "MaximumVersion", "type": "int32", "versions": "0+",
          "about": "The maximum supported version for the metadata." },
        { "name": "Version", "type": "int32", "versions": "0+",
          "about": "The version of the metadata." },
        { "name": "Reason", "type": "byte", "versions": "0+",
          "about": "The reason of the metadata update." }, 
        { "name": "Metadata", "type": "bytes", "versions": "0+",
          "about": "The metadata." }
      ]},
    { "name": "TopicPartitions", "type": "[]TopicPartition", "versions": "0+", "nullableVersions": "0+", "default": "null",
      "about": "null if it didn't change since the last heartbeat; the topics owned by the member.",
      "fields": [
        { "name": "TopicId", "type": "uuid", "versions": "0+",
          "about": "The topic ID." },
        { "name": "Partitions", "type": "[]int32", "versions": "0+",
          "about": "The partitions." }
      ]}
  ]
}