When you are either in client specific alerts or your entire alerts overview, you can batch update alerts instead of updating one at a time. While you are viewing your alerts, using the checkboxes, you can select one, multiple or Select All of the alerts you would like to update.
After the selection, click the Batch Update button. You can then mark an alert as addressed, no action taken or delete it. You can also leave comments on the alert(s). Click Save and your alerts will be resolved.
Note: Don't forget you can also sort and filter your alerts before or after you address them.