However, you can delete the custom alert templates.
Procedure
Choose
Alerts
> Manage Alert Templates
from the navigation menu.
Select the check box next to the template name and click the
Remove selected template(s) button (that is located above the list on the top banner). You can delete only the custom templates.
Click
Yes on the confirmation window to delete the selected alert template. The confirmation window lists all associated alert rules for the selected template.
Note: When you delete the selected template, all associated alert rules that are using this template use the default templates.
The selected template is removed from the
Manage Alert Template list.