admin_bar_links_alert in core/modules/admin_bar/
Build alert indicator.
backdrop_check_module in core/includes/
Checks a module's requirements.
drupal_requirements_severity in core/includes/
Extracts the highest severity from the requirements array.
install_verify_requirements in core/includes/
Verifies the requirements for installing Backdrop.
system_status in core/modules/system/
Menu callback: displays the site status report. Can also be used as a pure check.
update_check_requirements in core/update.php
Checks update requirements and reports errors and (optionally) warnings.