_update_manager_extract_directory($create = TRUE) Returns the directory where update archive files should be
Handles updates of Drupal core and contributed projects. The module checks for available updates of Drupal core and any installed contributed
update_themes_installed($themes) Implements
update_form_system_modules_alter(&$form, FormStateInterface $form_state) Implements
update_theme() Implements
Project is up to date. File core/modules/update/
update_help($route_name, RouteMatchInterface $route_match) Implements
update_storage_clear() Invalidates stored data relating to update status. File
_update_message_text($msg_type, $msg_reason, $langcode = NULL) Returns the appropriate message text when site
Project has a new release available, but it is not a security release. File core/modules/update/
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