Alert history lists the alerts to which an administrator responded. The alerts remain in history for up to 30 days or until you delete them. When you view the alert history, you can filter the list to show errors, warnings, or informational messages only.
To view and filter alert history
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In the Alert History Filter box, click one of the alerts you want.
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Click a column heading to sort the list in ascending or descending order.
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Click and drag a column to a new position in the list, and then drop it into place to change the order in which columns are displayed.