You can configure the alert retention policies to set the duration to automatically close and delete the alerts from Change Guardian.
To configure the alert retention policy:
From the web console, click ADMINISTRATION > Storage > Alert.
Specify the following:
The number of days from the date of creation of alerts, after which the alert status is set to closed.
The number of days from the date of closure of alerts, after which the alerts are deleted from Change Guardian.
Save the alert retention policy.