A system administrator and OCP alert manager can delete alert items. System built-in alert items cannot be deleted.
Prerequisites
You are logged on with an account that has the ADMIN or ALARM_MANAGER role.
You have created an alert item. For more information, see Create an alert item. You can only delete user-defined alert items.
Procedure
Log on to the OCP console.
In the left-side navigation pane, choose System Management > Alerts .
On the Alert Item Configuration tab, find the target alert item.
Click Delete in the Actions column of the alert item or in ... .

In the message that appears, click OK .