You can delete alert rules that you no longer need.
Procedure
Log on to the Cloud Monitor console.
In the navigation pane on the left, choose .
Delete one or more alert rules.
To delete a single alert rule:
Click the
icon in the Actions column for the target alert rule, and then click Delete.In the Delete Alert dialog box, click OK.
To delete multiple alert rules:
Select the alert rules that you want to delete and click Delete in the lower-left corner.
In the Delete Alert dialog box, click OK.