// +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 {

  // +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 {

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

  // provisioner indicates the type of the provisioner.
  optional string provisioner = 2;

  // parameters holds the parameters for the provisioner that should
  // create volumes of this storage class.
  // +optional
  map<string, string> parameters = 3;

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

  // spec represents specification of the RuntimeClass
  // More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#spec-and-status
  optional RuntimeClassSpec spec = 2;
}

// RuntimeClassList is a list of RuntimeClass objects.

  // nodes.
  // +optional
  optional Scheduling scheduling = 4;
}

// RuntimeClassList is a list of RuntimeClass objects.
message RuntimeClassList {
  // 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;

  // 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

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

  // Specification of the desired behavior of the PodDisruptionBudget.
  // +optional
  optional PodDisruptionBudgetSpec spec = 2;

  // Most recently observed status of the PodDisruptionBudget.
  // +optional
  optional PodDisruptionBudgetStatus status = 3;
}

  // 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;

  // APIGroups, APIVersions, Resources, etc.
  optional Rule rule = 2;
}

// ServiceReference holds a reference to Service.legacy.k8s.io
message ServiceReference {
  // `namespace` is the namespace of the service.
  // Required
  optional string namespace = 1;

  // `name` is the name of the service.
  // Required
  optional string name = 2;

  // `path` is an optional URL path which will be sent in any request to

message PartialObjectMetadataList {
  // Standard list metadata.
  // More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#types-kinds
  // +optional
  optional k8s.io.apimachinery.pkg.apis.meta.v1.ListMeta metadata = 2;

  // items contains each of the included items.
  repeated k8s.io.apimachinery.pkg.apis.meta.v1.PartialObjectMetadata items = 1;