// "csi.storage.k8s.io/serviceAccount.tokens": {
  //   "<audience>": {
  //     "token": <token>,
  //     "expirationTimestamp": <expiration timestamp in RFC3339>,
  //   },
  //   ...
  // }
  //
  // Note: Audience in each TokenRequest should be different and at
  // most one token is empty string. To receive a new token after expiry,
  // RequiresRepublish can be used to trigger NodePublishVolume periodically.
  //