auto metadata = gcs_client->GetObjectMetadata(
      bucket, object, gcs::Fields("generation,size,timeStorageClassUpdated"));
  if (!metadata) return TF_SetStatusFromGCSStatus(metadata.status(), status);
  stat->generation_number = metadata->generation();
  stat->base.length = metadata->size();
  stat->base.mtime_nsec =
      metadata->time_storage_class_updated().time_since_epoch().count();