Entity alerting
Entity alerting allows users to enable notifications for themselves or any custom email. Alerting is available for catalog objects, glossary terms, and test cases.
Enabling/disabling notifications
Users without edit rights can click on
icon to enable/disable notifications.
Admins and users with edit rights can open the detailed alerting modal: 
In alerting modal both users and custom emails can be inserted
Test case alerting
Test cases support alerting with configurable notification types. You can enable alerting for individual test cases from the test case detailed view.

Available alert types:
Execution alerts - receive notifications when a test case execution completes (triggered by test case schedule or direct API execution, not when run as part of a test suite)
Change alerts - receive notifications when a test case configuration is modified
Users can choose which types of alerts they want to receive when configuring notifications.