6 uses of MAINTENANCE_MODE
- hook_cache_flush in core/
core.api.php  - Flush all persistent and static caches.
 - StatusReport::preRenderGroupRequirements in core/
lib/ Drupal/ Core/ Render/ Element/ StatusReport.php  - #pre_render callback to group requirements.
 - StatusReportPage::preRenderCounters in core/
modules/ system/ src/ Element/ StatusReportPage.php  - #pre_render callback to create counter elements.
 - template_preprocess_install_page in core/
includes/ theme.inc  - Prepares variables for install page templates.
 - user_role_permissions in core/
modules/ user/ user.module  - Determine the permissions for one or more roles.
 - _drupal_maintenance_theme in core/
includes/ theme.maintenance.inc  - Sets up the theming system for maintenance page.
 
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