update_storage_clear_submit($form, FormStateInterface $form_state)
Form submission handler for system_modules().
update_form_system_modules_alter()
function update_storage_clear_submit($form, FormStateInterface $form_state) { // Clear all update module data. update_storage_clear(); }
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https://api.drupal.org/api/drupal/core!modules!update!update.module/function/update_storage_clear_submit/8.1.x