//
  // +optional
  optional ServiceReference service = 1;

  // `caBundle` is a PEM encoded CA bundle which will be used to validate the webhook's server certificate.
  // If unspecified, system trust roots on the apiserver are used.
  // +optional
  optional bytes caBundle = 2;

  // +optional
  optional string namespace = 5;
}

// IngressClassSpec provides information about the class of an Ingress.
message IngressClassSpec {
  // controller refers to the name of the controller that should handle this
  // class. This allows for different "flavors" that are controlled by the
  // same controller. For example, you may have different parameters for the
  // same implementing controller. This should be specified as a

  //
  // Custom signerNames can also be specified. The signer defines:
  //  1. Trust distribution: how trust (CA bundles) are distributed.
  //  2. Permitted subjects: and behavior when a disallowed subject is requested.

  //
  // +optional
  optional ServiceReference service = 1;

  // `caBundle` is a PEM encoded CA bundle which will be used to validate the webhook's server certificate.
  // If unspecified, system trust roots on the apiserver are used.
  // +optional
  optional bytes caBundle = 2;

  // database by the API server during CronJob validation and the controller manager during execution.
  // If no system-wide time zone database can be found a bundled version of the database is used instead.
  // If the time zone name becomes invalid during the lifetime of a CronJob or due to a change in host

  // See https://github.com/kubernetes/apiserver/blob/master/pkg/authentication/user/user.go for some
  // well-known group names.
  // Required.
  optional string name = 1;
}

// LimitResponse defines how to handle requests that can not be executed right now.
// +union
message LimitResponse {
  // `type` is "Queue" or "Reject".
  // "Queue" means that requests that can not be executed upon arrival

  // See https://github.com/kubernetes/apiserver/blob/master/pkg/authentication/user/user.go for some
  // well-known group names.
  // Required.
  optional string name = 1;
}

// LimitResponse defines how to handle requests that can not be executed right now.
// +union
message LimitResponse {
  // `type` is "Queue" or "Reject".
  // "Queue" means that requests that can not be executed upon arrival

  // +optional
  optional string namespace = 5;
}

// IngressClassSpec provides information about the class of an Ingress.
message IngressClassSpec {
  // controller refers to the name of the controller that should handle this
  // class. This allows for different "flavors" that are controlled by the
  // same controller. For example, you may have different parameters for the
  // same implementing controller. This should be specified as a

}

// VolumeAttachmentSpec is the specification of a VolumeAttachment request.
message VolumeAttachmentSpec {
  // attacher indicates the name of the volume driver that MUST handle this
  // request. This is the name returned by GetPluginName().
  optional string attacher = 1;

  // source represents the volume that should be attached.
  optional VolumeAttachmentSource source = 2;

  //
  // Clients should expect to handle additional values by ignoring
  // any values not recognized.
  //
  // "Deny" and "Warn" may not be used together since this combination
  // needlessly duplicates the validation failure both in the