public static function send_data( $data, $codec_name, $sent_timestamp, $queue_id, $checkout_duration, $preprocess_duration, $queue_size = null, $buffer_id = null ) {
    $query_args = array(
      'sync'       => '1',             // Add an extra parameter to the URL so we can tell it's a sync action.
      'codec'      => $codec_name,
      'timestamp'  => $sent_timestamp,
      'queue'      => $queue_id,
      'home'       => Functions::home_url(),  // Send home url option to check for Identity Crisis server-side.
      'siteurl'    => Functions::site_url(),  // Send siteurl option to check for Identity Crisis server-side.
      'cd'         => sprintf( '%.4f', $checkout_duration ),
      'pd'         => sprintf( '%.4f', $preprocess_duration ),
      'queue_size' => $queue_size,
      'buffer_id'  => $buffer_id,
    );

    // Has the site opted in to IDC mitigation?
    if ( \Jetpack::sync_idc_optin() ) {
      $query_args['idc'] = true;
    }

    if ( \Jetpack_Options::get_option( 'migrate_for_idc', false ) ) {
      $query_args['migrate_for_idc'] = true;
    }

    $query_args['timeout'] = Settings::is_doing_cron() ? 30 : 15;

    
/**
 * Filters query parameters appended to the Sync request URL sent to WordPress.com.
 *
 * @since 4.7.0
 *
 * @param array $query_args associative array of query parameters.
 */
    $query_args = apply_filters( 'jetpack_sync_send_data_query_args', $query_args );

    $connection = new Jetpack_Connection();
    $url        = add_query_arg( $query_args, $connection->xmlrpc_api_url() );

    // If we're currently updating to Jetpack 7.7, the IXR client may be missing briefly
    // because since 7.7 it's being autoloaded with Composer.
    if ( ! class_exists( '\\Jetpack_IXR_Client' ) ) {
      return new \WP_Error(
        'ixr_client_missing',
        esc_html__( 'Sync has been aborted because the IXR client is missing.', 'jetpack' )
      );
    }

    $rpc = new \Jetpack_IXR_Client(
      array(
        'url'     => $url,
        'user_id' => JETPACK_MASTER_USER,
        'timeout' => $query_args['timeout'],
      )
    );

    $result = $rpc->query( 'jetpack.syncActions', $data );

    if ( ! $result ) {
      return $rpc->get_jetpack_error();
    }

    $response = $rpc->getResponse();

    // Check if WordPress.com IDC mitigation blocked the sync request.
    if ( is_array( $response ) && isset( $response['error_code'] ) ) {
      $error_code              = $response['error_code'];
      $allowed_idc_error_codes = array(
        'jetpack_url_mismatch',
        'jetpack_home_url_mismatch',
        'jetpack_site_url_mismatch',
      );

      if ( in_array( $error_code, $allowed_idc_error_codes, true ) ) {
        \Jetpack_Options::update_option(
          'sync_error_idc',
          \Jetpack::get_sync_error_idc_option( $response )
        );
      }

      return new \WP_Error(
        'sync_error_idc',
        esc_html__( 'Sync has been blocked from WordPress.com because it would cause an identity crisis', 'jetpack' )
      );
    }

    return $response;
  }