public function __construct() {
    $this->librarian = new Jetpack_Sitemap_Librarian();
    $this->finder    = new Jetpack_Sitemap_Finder();

    if ( defined( 'WP_DEBUG' ) && WP_DEBUG ) {
      $this->logger = new Jetpack_Sitemap_Logger();
    }

    update_option(
      'jetpack_sitemap_post_types',
      
/**
 * The array of post types to be included in the sitemap.
 *
 * Add your custom post type name to the array to have posts of
 * that type included in the sitemap. The default array includes
 * 'page' and 'post'.
 *
 * The result of this filter is cached in an option, 'jetpack_sitemap_post_types',
 * so this filter only has to be applied once per generation.
 *
 * @since 4.8.0
 */
      apply_filters(
        'jetpack_sitemap_post_types',
        array( 'post', 'page' )
      )
    );
  }