The UpdateFetcher service. Type:

public UpdateKernel::handle(Request $request, $type = self::MASTER_REQUEST

update_storage_clear_submit($form, FormStateInterface $form_state) Form submission handler for system_modules()

The private key. Type:

public UpdateReady::submitForm(array &$form, FormStateInterface

public UpdateManager::__construct(ConfigFactoryInterface $config_factory

public UpdateProcessorInterface::processFet

The state key value store. Type:

public UpdateRegistry::getModuleUpdateFunctions($module_name)

update_calculate_project_data($available) Calculates the current update status of all projects on the site