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