6 uses of MENU_SITE_ONLINE

hook_menu_site_status_alter in drupal/core/modules/system/system.api.php
Control site status before menu dispatching.
MaintenanceModeSubscriber::onKernelRequestMaintenanceModeCheck in drupal/core/lib/Drupal/Core/EventSubscriber/MaintenanceModeSubscriber.php
Response with the maintenance page when the site is offline.
menu_test_menu_site_status_alter in drupal/core/modules/system/tests/modules/menu_test/menu_test.module
Implements hook_menu_site_status_alter().
openid_menu_site_status_alter in drupal/core/modules/openid/openid.module
Implements hook_menu_site_status_alter().
openid_test_menu_site_status_alter in drupal/core/modules/openid/tests/openid_test.module
Implements hook_menu_site_status_alter().
user_menu_site_status_alter in drupal/core/modules/user/user.module
Implements hook_menu_site_status_alter().