wp-admin/includes/class-wp-site-health.php:79Returns an instance of the WP_Site_Health class, or create one if none exist yet.
WP_Site_Health|null public static function get_instance() { if ( null === self::$instance ) { self::$instance = new WP_Site_Health(); } return self::$instance; }Introduced in 5.4.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-admin/includes/class-wp-site-health.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.