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{
  "apiKey": TBD,
  "type": "response",
  "name": "StreamsGroupHeartbeatResponse",
  "validVersions": "0",  // "0" in 4.2/4.3 release; bumped to "0-1" in 4.4 release 
  "flexibleVersions": "0+",
  // Supported errors:
  // - GROUP_AUTHORIZATION_FAILED (version 0+)
  // - GROUP_ID_NOT_FOUND (version 0+)
  // - NOT_COORDINATOR (version 0+)
  // - COORDINATOR_NOT_AVAILABLE (version 0+)
  // - COORDINATOR_LOAD_IN_PROGRESS (version 0+)
  // - INVALID_REQUEST (version 0+)
  // - UNKNOWN_MEMBER_ID (version 0+)
  // - FENCED_MEMBER_EPOCH (version 0+)
  // - UNRELEASED_INSTANCE_ID (version 0+)
  // - GROUP_MAX_SIZE_REACHED (version 0+)
  // - TOPIC_AUTHORIZATION_FAILED (version 0+) 
  // - CLUSTER_AUTHORIZATION_FAILED (version 0+)
  // - STREAMS_INVALID_TOPOLOGY (version 0+)
  // - STREAMS_INVALID_TOPOLOGY_EPOCH (version 0+)
  // - STREAMS_TOPOLOGY_FENCED (version 0+)
  "fields": [
    { "name": "ThrottleTimeMs", "type": "int32", "versions": "0+",
      "about": "The duration in milliseconds for which the request was throttled due to a quota violation, or zero if the request did not violate any quota." },
    { "name": "ErrorCode", "type": "int16", "versions": "0+",
      "about": "The top-level error code, or 0 if there was no error" },
    { "name": "ErrorMessage", "type": "string", "versions": "0+", "nullableVersions": "0+", "default": "null",
      "about": "The top-level error message, or null if there was no error." },      
    { "name": "MemberId", "type": "string", "versions": "0+",
      "about": "The member id is always generated by the streams consumer."},     
    { "name": "MemberEpoch", "type": "int32", "versions": "0+",
      "about": "The member epoch." },

    { "name": "HeartbeatIntervalMs", "type": "int32", "versions": "0+",
      "about": "The heartbeat interval in milliseconds." },
    { "name": "AcceptableRecoveryLag", "type": "int32", "versions": "0+",
      "about": "The maximal lag a warm-up task can have to be considered caught-up." },  // incorrectly implemented as `int32` in 4.2 release; updated to `int64` and request/response version bump to "1" in 4.34 release.
    { "name": "RackAwareAssignmentTags", "type": "[]string", "versions": "1+",
      "about": "The assignment tags used by the group coordinator for rack aware standby task assignment." }, // added in 4.4 release
    { "name": "TaskOffsetIntervalMs", "type": "int32", "versions": "0+",
      "about": "The interval in which the task changelog offsets on a client are updated on the broker. The offsets are sent with the next heartbeat after this time has passed." },

    { "name": "Status", "type":  "[]Status", "versions":  "0+",  "nullableVersions": "0+", "default": "null",
      "about": "Indicate zero or more status for the group.  Null if unchanged since last heartbeat." },

    // The streams app knows which partitions to fetch from given this information
    { "name": "ActiveTasks", "type": "[]TaskIds", "versions": "0+", "nullableVersions": "0+", "default": "null",
      "about": "Assigned active tasks for this client. Null if unchanged since last heartbeat." },
    { "name": "StandbyTasks", "type": "[]TaskIds", "versions": "0+", "nullableVersions": "0+", "default": "null",
      "about": "Assigned standby tasks for this client. Null if unchanged since last heartbeat." },
    { "name": "WarmupTasks", "type": "[]TaskIds", "versions": "0+", "nullableVersions": "0+", "default": "null",
      "about": "Assigned warm-up tasks for this client. Null if unchanged since last heartbeat." },

    // IQ-related information
    { "name": "EndpointInformationEpoch", "type": "int32", "versions": "0+",
      "about": "The endpoint epoch set in the response"}, 
    { "name": "PartitionsByUserEndpoint", "type": "[]EndpointToPartitions", "versions": "0+", "nullableVersions": "0+", "default": "null",
      "about": "Global assignment information used for IQ. Null if unchanged since last heartbeat." ,
      "fields": [
        { "name": "UserEndpoint", "type": "Endpoint", "versions": "0+",
          "about": "User-defined endpoint to connect to the node" },
        { "name": "ActivePartitions", "type": "[]TopicPartition", "versions": "0+",
          "about": "All active partitions available on the node" },
        { "name": "StandbyPartitions", "type": "[]TopicPartition", "versions": "0+",
          "about": "All standby paritions available on the node"}
      ]
    }
  ],
  "commonStructs": [
    { "name": "Status", "versions": "0+", "fields": [
      // Possible status codes
      //  0 - STALE_TOPOLOGY                 - The topology epoch supplied is lower than the topology epoch for this streams group.
      //  1 - MISSING_SOURCE_TOPICS          - One or more source topics are missing or a source topic regex resolves to zero topics.
      //                                       Missing topics are indicated in the StatusDetail.
      //  2 - INCORRECTLY_PARTITIONED_TOPICS - One or more topics are incorrectly partitioned, that is, they are not copartitioned despite being 
      //                                       part of a copartition group, or the number of partitions in a changelog topic does not correspond
      //                                       to the maximal number of source topic partition for that subtopology.
      //                                       Incorrectly partitioned topics are indicated in the StatusDetail.
      //  3 - MISSING_INTERNAL_TOPICS        - One or more internal topics are missing. 
      //                                       Missing topics are indicated in the StatusDetail. 
      //                                       The group coordinator will attempt to create all missing internal topics, if any errors occur during
      //                                       topic creation, this will be indicated in StatusDetail.
      //  4 - SHUTDOWN_APPLICATION           - A client requested the shutdown of the whole application.
      //  5 - ASSIGNMENT_DELAYED             - No assignment was provided because assignment computation was delayed.
      { "name": "StatusCode", "type": "int8", "versions": "0+",
        "about": "A code to indicate that a particular status is active for the group membership" },
      { "name": "StatusDetail", "type": "string", "versions": "0+",
        "about": "A string representation of the status." }
    ]},
    { "name": "TopicPartition", "versions": "0+", "fields": [
      { "name": "Topic", "type": "string", "versions": "0+",
        "about": "topic name" },
      { "name": "Partitions", "type": "[]int32", "versions": "0+",
        "about": "partitions" }
    ]},
    { "name": "TaskIds", "versions": "0+", "fields": [
      { "name": "SubtopologyId", "type": "string", "versions": "0+",
        "about": "The subtopology identifier." },
      { "name": "Partitions", "type": "[]int32", "versions": "0+",
        "about": "The partitions of the input topics processed by this member." }
    ]},
    { "name": "Endpoint", "versions": "0+", "fields": [
      { "name": "Host", "type": "string", "versions": "0+",
        "about": "host of the endpoint" },
      { "name": "Port", "type": "uint16", "versions": "0+",
        "about": "port of the endpoint" }
    ]}
  ]
}