// mount of the PVs will simply fail if one is invalid.
  // +optional
  repeated string mountOptions = 5;

  // allowVolumeExpansion shows whether the storage class allow volume expand
  // +optional
  optional bool allowVolumeExpansion = 6;

  // volumeBindingMode indicates how PersistentVolumeClaims should be
  // provisioned and bound.  When unset, VolumeBindingImmediate is used.

  // mount of the PVs will simply fail if one is invalid.
  // +optional
  repeated string mountOptions = 5;

  // allowVolumeExpansion shows whether the storage class allow volume expand.
  // +optional
  optional bool allowVolumeExpansion = 6;

  // volumeBindingMode indicates how PersistentVolumeClaims should be
  // provisioned and bound.  When unset, VolumeBindingImmediate is used.

  // Variable references $(VAR_NAME) are expanded using the container's environment. If a variable
  // cannot be resolved, the reference in the input string will be unchanged. Double $$ are reduced
  // to a single $, which allows for escaping the $(VAR_NAME) syntax: i.e. "$$(VAR_NAME)" will
  // produce the string literal "$(VAR_NAME)". Escaped references will never be expanded, regardless