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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