throw new IllegalStateException("Optional.get() cannot be called on an absent value");
  }

  @Override
  public T or(T defaultValue) {
    return checkNotNull(defaultValue, "use Optional.orNull() instead of Optional.or(null)");
  }

  @SuppressWarnings("unchecked") // safe covariant cast
  @Override
  public Optional<T> or(Optional<? extends T> secondChoice) {
    return (Optional<T>) checkNotNull(secondChoice);
  }

  // observed renewTime.
  // +optional
  optional int32 leaseDurationSeconds = 2;

  // acquireTime is a time when the current lease was acquired.
  // +optional
  optional k8s.io.apimachinery.pkg.apis.meta.v1.MicroTime acquireTime = 3;

  // renewTime is a time when the current holder of a lease has last
  // updated the lease.
  // +optional
  optional k8s.io.apimachinery.pkg.apis.meta.v1.MicroTime renewTime = 4;

  // +optional
  optional UserSubject user = 2;

  // `group` matches based on user group name.
  // +optional
  optional GroupSubject group = 3;

  // `serviceAccount` matches ServiceAccounts.
  // +optional
  optional ServiceAccountSubject serviceAccount = 4;
}

// UserSubject holds detailed information for user-kind subject.
message UserSubject {

    name: Optional[str] = None
    call: Optional[Callable[..., Any]] = None
    request_param_name: Optional[str] = None
    websocket_param_name: Optional[str] = None
    http_connection_param_name: Optional[str] = None
    response_param_name: Optional[str] = None
    background_tasks_param_name: Optional[str] = None
    security_scopes_param_name: Optional[str] = None

  // +optional
  optional k8s.io.apimachinery.pkg.apis.meta.v1.ObjectMeta metadata = 1;

  // Spec holds information about the request being evaluated
  optional TokenReviewSpec spec = 2;

  // Status is filled in by the server and indicates whether the token can be authenticated.
  // +optional
  optional TokenReviewStatus status = 3;
}

// TokenReviewSpec is a description of the token authentication request.

  // operation, i.e. the external-attacher.
  // +optional
  optional VolumeAttachmentStatus status = 3;
}

// VolumeAttachmentList is a collection of VolumeAttachment objects.
message VolumeAttachmentList {
  // Standard list metadata
  // More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#metadata
  // +optional
  optional k8s.io.apimachinery.pkg.apis.meta.v1.ListMeta metadata = 1;

  // Required
  optional string name = 2;

  // `path` is an optional URL path which will be sent in any request to
  // this service.
  // +optional
  optional string path = 3;

  // If specified, the port on the service that hosting webhook.
  // Default to 443 for backward compatibility.
  // `port` should be a valid port number (1-65535, inclusive).
  // +optional
  optional int32 port = 4;
}

  // observed renewTime.
  // +optional
  optional int32 leaseDurationSeconds = 2;

  // acquireTime is a time when the current lease was acquired.
  // +optional
  optional k8s.io.apimachinery.pkg.apis.meta.v1.MicroTime acquireTime = 3;

  // renewTime is a time when the current holder of a lease has last
  // updated the lease.
  // +optional
  optional k8s.io.apimachinery.pkg.apis.meta.v1.MicroTime renewTime = 4;

  // fungible (e.g. multiple A values in DNS). Must be lowercase and pass DNS
  // Label (RFC 1123) validation.
  // +optional
  optional string hostname = 3;

  // targetRef is a reference to a Kubernetes object that represents this
  // endpoint.
  // +optional
  optional k8s.io.api.core.v1.ObjectReference targetRef = 4;

  // topology contains arbitrary topology information associated with the

    ] = None,
    title: Annotated[
        Optional[str],
        Doc(
            """
            Human-readable title.
            """
        ),
    ] = None,
    description: Annotated[
        Optional[str],
        Doc(
            """
            Human-readable description.
            """
        ),
    ] = None,
    gt: Annotated[
        Optional[float],
        Doc(
            """