app/code/Magento/ProductAlert/README.md
This module enables product alerts, which allow customers to sign up for emails about product price or stock status changes.
Before installing this module, note that this module is dependent on the following modules:
Magento_CatalogMagento_CustomerThe Magento_ProductAlert module creates the following tables in the database:
product_alert_priceproduct_alert_stockAll database schema changes made by this module are rolled back when the module gets disabled and setup:upgrade command is run.
The Magento_ProductAlert module contains the recurring script. The script's modifications don't need to be manually reverted upon uninstallation.
For information about a module installation, see Enable or disable modules.
Extension developers can interact with the Magento_ProductAlert module. For more information about the extension mechanism, see Plugins.
The dependency injection mechanism enables you to override the functionality of the Magento_ProductAlert module.
This module introduces the following layouts in the view/frontend/layout directory:
catalog_product_viewproductalert_unsubscribe_emailFor more information about a layout, see the Layout documentation.
You can get more information at the following articles:
Cron group configuration can be set at etc/crontab.xml:
catalog_product_alert - send product alerts to customers.