Several changes were applied to improve security. See ADV-2017-17, ADV-2017-19, ADV-2017-20 and ADV-2017-21 in Security Bulletins for more details.
Support for data-driven alerts
When data reaches important thresholds for your business, data-driven alerts automatically send email notifications to key people users specify. For information on how to create and manage these alerts, see Send Data-Driven Alerts in Tableau User Help.