code: func FlushGrantsLog(c context.Context) error {
  	_, err := oauthTokenGrantsLog.Flush(c)
  	return err
  }
docs: // FlushGrantsLog sends all buffered logged grants to BigQuery.
  //
  // It is fine to call FlushGrantLog concurrently from multiple request handlers,
  // if necessary (it will effectively parallelize the flush).