You can stop suppressing an alert from the Alerts page or from the details page for the alert.
To stop suppressing an alert from the Alerts page:
Open the Alerts page and filter or sort alerts as you wish. See Viewing the alerts page.
Select the checkbox for the alert you want to stop suppressing in the left column.
Right-click the row or click
at the end of the row. Select Unsuppress.
To stop suppressing an alert from its alert details page:
Access the details page for an alert. See Viewing alert details.
Select Unsuppress from the drop-down menu on the upper right of the page.