When you delete an alert, you delete the definition of the alert and end any alert monitoring. As an alternative, you can disable an alert if you do not want it to be active, but might use it in the future.
You cannot delete the some pre-defined alerts provided by the Carbon Black App Control Server, and these do not have a Delete button.
To delete an alert, on the Alerts page, click the Delete (X) button next to the alert. In the confirmation dialog box, click Yes.