// ApiVersionsRequest requests what API versions a Kafka broker supports.
//
// Note that the client does not know the version a broker supports before
// sending this request.
//
// Before Kafka 2.4.0, if the client used a version larger than the broker
// understands, the broker would reply with an UNSUPPORTED_VERSION error using
// the version 0 message format (i.e., 6 bytes long!). The client should retry
// with a lower version.
//
// After Kafka 2.4.0, if the client uses a version larger than the broker
// understands, the broker replies with UNSUPPORTED_VERSIONS using the version
// 0 message format but additionally includes the api versions the broker does
// support.
ApiVersionsRequest => key 18, max version 3, flexible v3+
  // ClientSoftwareName, added for KIP-511 with Kafka 2.4.0, is the name of the
  // client issuing this request. The broker can use this to enrich its own
  // debugging information of which version of what clients are connected.
  //
  // If using v3, this field is required and must match the following pattern:
  //
  //     [a-zA-Z0-9](?:[a-zA-Z0-9\\-.]*[a-zA-Z0-9])?
  //
  ClientSoftwareName: string // v3+
  // ClientSoftwareVersion is the version of the software name in the prior
  // field. It must match the same regex (thus, this is also required).
  ClientSoftwareVersion: string // v3+

// ApiVersionsResponse is returned from an ApiVersionsRequest.
ApiVersionsResponse =>
  // ErrorCode is UNSUPPORTED_VERSION if the request was issued with a higher
  // version than the broker supports. Before Kafka 2.4.0, if this error is
  // returned, the rest of this struct will be empty.
  //
  // Starting in Kafka 2.4.0 (with version 3), even with an UNSUPPORTED_VERSION
  // error, the broker still replies with the ApiKeys it supports.
  ErrorCode: int16
  // ApiKeys is an array corresponding to API keys the broker supports
  // and the range of supported versions for each key.
  ApiKeys: [=>]
    // ApiKey is the key of a message request.
    ApiKey: int16
    // MinVersion is the min version a broker supports for an API key.
    MinVersion: int16
    // MaxVersion is the max version a broker supports for an API key.
    MaxVersion: int16
  ThrottleMillis(2) // v1+
  // Features supported by the broker (see KIP-584).
  SupportedFeatures: [=>] // tag 0
    // The name of the feature.
    Name: string
    // The minimum supported version for the feature.
    MinVersion: int16
    // The maximum supported version for the feature.
    MaxVersion: int16
  // The monotonically increasing epoch for the finalized features information,
  // where -1 indicates an unknown epoch.
  FinalizedFeaturesEpoch: int64(-1) // tag 1
  // The list of cluster-wide finalized features (only valid if
  // FinalizedFeaturesEpoch is >= 0).
  FinalizedFeatures: [=>] // tag 2
    // The name of the feature.
    Name: string
    // The cluster-wide finalized max version level for the feature.
    MaxVersionLevel: int16
    // The cluster-wide finalized min version level for the feature.
    MinVersionLevel: int16
  // Set by a KRaft controller if the required configurations for ZK migration
  // are present
  ZkMigrationReady: bool // tag 3