OME Home Portal Alerts pie chart

Is there any way to remove the critical and warning alerts from the "Alerts by Severity" pie chart without deleting alerts from OME? I want to keep the history of the alerts but management does not want to see the Critical alerts in the pie chart if nothing's actually wrong, or the issue has been resolved. Acknowledging the alerts doesn't appear to affect the pie chart whatsoever.

I'm running OME 2.2.0.2056.

Thanks.