// For KIP-500 / KIP-631, BrokerRegistrationRequest is an internal
// broker-to-broker only request.
BrokerRegistrationRequest => key 62, max version 1, flexible v0+
  // The broker ID.
  BrokerID: int32
  // The cluster ID of the broker process.
  ClusterID: string
  // The incarnation ID of the broker process.
  IncarnationID: uuid
  // The listeners for this broker.
  Listeners: [=>]
    // The name of this endpoint.
    Name: string
    // The hostname.
    Host: string
    // The port.
    Port: uint16
    // The security protocol.
    SecurityProtocol: int16
  // Features on this broker.
  Features: [=>]
    // The name of the feature.
    Name: string
    // The minimum supported feature level.
    MinSupportedVersion: int16
    // The maximum supported feature level.
    MaxSupportedVersion: int16
  // The rack that this broker is in, if any.
  Rack: nullable-string
  // If the required configurations for ZK migration are present, this value is
  // set to true.
  IsMigratingZkBroker: bool // v1+

// BrokerRegistrationResponse is a response to a BrokerRegistrationRequest.
BrokerRegistrationResponse =>
  ThrottleMillis
  // Any error code, or 0.
  ErrorCode: int16
  // The broker's assigned epoch, or -1 if none was assigned.
  BrokerEpoch: int64(-1)