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{
  "apiKey": ...,
  "type": "request",
  "name": "ControllerRegistrationRequest",
  "validVersions": "0",
  "flexibleVersions": "0+",
  "fields": [
    { "name": "ControllerId", "type": "int32", "versions": "0+",
      "about": "The controller IDID of the controller to register." },
    { "name": "ActiveControllerEpoch", "type": "int32", "versions": "0+",
      "about": "The epoch of the current active controller." },
    { "name": "IncarnationId", "type": "uuid", "versions": "0+",
      "about": "The controller incarnation ID, which is unique to each process run." },
    { "name": "ZkMigrationReady", "type": "bool", "versions": "0+",
      "about": "Set if the required configurations for ZK migration are present." },
    { "name": "Listeners", "type": "[]Listener",
      "about": "The listeners of this controller", "versions": "0+", "fields": [
      { "name": "Name", "type": "string", "versions": "0+", "mapKey": true,
        "about": "The name of the endpoint." },
      { "name": "Host", "type": "string", "versions": "0+",
        "about": "The hostname." },
      { "name": "Port", "type": "uint16", "versions": "0+",
        "about": "The port." },
      { "name": "SecurityProtocol", "type": "int16", "versions": "0+",
        "about": "The security protocol." }
    ]
    },
    { "name": "Features", "type": "[]Feature",
      "about": "The features on this controller", "versions": "0+", "fields": [
      { "name": "Name", "type": "string", "versions": "0+", "mapKey": true,
        "about": "The feature name." },
      { "name": "MinSupportedVersion", "type": "int16", "versions": "0+",
        "about": "The minimum supported feature level." },
      { "name": "MaxSupportedVersion", "type": "int16", "versions": "0+",
        "about": "The maximum supported feature level." }
    ]
    }
  ]
}