repeated VolumeAttachment items = 2;
}

// VolumeAttachmentSource represents a volume that should be attached.
// Right now only PersistenVolumes can be attached via external attacher,
// in future we may allow also inline volumes in pods.
// Exactly one member can be set.
message VolumeAttachmentSource {
  // persistentVolumeName represents the name of the persistent volume to attach.
  // +optional

  // If scheduling is nil, this RuntimeClass is assumed to be supported by all
  // nodes.
  // +optional
  optional Scheduling scheduling = 3;
}

// Scheduling specifies the scheduling constraints for nodes supporting a
// RuntimeClass.
message Scheduling {
  // nodeSelector lists labels that must be present on nodes that support this
  // RuntimeClass. Pods using this RuntimeClass can only be scheduled to a

  // globalDefault specifies whether this PriorityClass should be considered as
  // the default priority for pods that do not have any priority class.
  // Only one PriorityClass can be marked as `globalDefault`. However, if more than
  // one PriorityClasses exists with their `globalDefault` field set to true,
  // the smallest value of such global default PriorityClasses will be used as the default priority.
  // +optional

  // ClusterRoleSelectors holds a list of selectors which will be used to find ClusterRoles and create the rules.
  // If any of the selectors match, then the ClusterRole's permissions will be added
  // +optional
  repeated k8s.io.apimachinery.pkg.apis.meta.v1.LabelSelector clusterRoleSelectors = 1;
}

// ClusterRole is a cluster level, logical grouping of PolicyRules that can be referenced as a unit by a RoleBinding or ClusterRoleBinding.

// RuntimeClass.
message Scheduling {
  // nodeSelector lists labels that must be present on nodes that support this
  // RuntimeClass. Pods using this RuntimeClass can only be scheduled to a
  // node matched by this selector. The RuntimeClass nodeSelector is merged
  // with a pod's existing nodeSelector. Any conflicts will cause the pod to
  // be rejected in admission.
  // +optional
  // +mapType=atomic

  // 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
  // configuration, the controller will stop creating new new Jobs and will create a system event with the
  // reason UnknownTimeZone.

  // the backend (e.g., etcd).
  optional string encodingVersion = 2;

  // The API server can decode objects encoded in these versions.
  // The encodingVersion must be included in the decodableVersions.
  // +listType=set
  repeated string decodableVersions = 3;
}

// Storage version of a specific resource.
message StorageVersion {
  // The name is <group>.<resource>.

message APIGroupDiscovery {
  // Standard object's metadata.
  // The only field completed will be name. For instance, resourceVersion will be empty.
  // name is the name of the API group whose discovery information is presented here.
  // name is allowed to be "" to represent the legacy, ungroupified resources.

  //
  // For example, if deployments can be modified via apps/v1 and apps/v1beta1, and a webhook registered a rule of
  // `apiGroups:["apps"], apiVersions:["v1"], resources: ["deployments"]` and `matchPolicy: Equivalent`,
  // an API request to apps/v1beta1 deployments would be converted and sent to the webhook

// +k8s:openapi-gen=true
message TypeMeta {
  // +optional
  optional string apiVersion = 1;

  // +optional
  optional string kind = 2;
}

// Unknown allows api objects with unknown types to be passed-through. This can be used
// to deal with the API objects from a plug-in. Unknown objects still have functioning
// TypeMeta features-- kind, version, etc.
// TODO: Make this object have easy access to field based accessors and settors for