//  4. Required, permitted, or forbidden key usages / extended key usages.
  //  5. Expiration/certificate lifetime: whether it is fixed by the signer, configurable by the admin.
  //  6. Whether or not requests for CA certificates are allowed.
  optional string signerName = 7;

  // expirationSeconds is the requested duration of validity of the issued

  // glusterfs represents a Glusterfs volume that is attached to a host and
  // exposed to the pod. Provisioned by an admin.
  // More info: https://examples.k8s.io/volumes/glusterfs/README.md
  // +optional
  optional GlusterfsPersistentVolumeSource glusterfs = 4;

  // nfs represents an NFS mount on the host. Provisioned by an admin.
  // More info: https://kubernetes.io/docs/concepts/storage/volumes#nfs
  // +optional