After upgrading to the latest version 8.9 of Active Administrator, the Event ID log filter in the audit reports no longer works. Although we can enter the desired Event ID, it is completely ignored in the results. So if this is the only filter applied, the result will show all events in the selected time period. This used to work in earlier versions.

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We have verified that this is a defect in our labs. We have created a defect to correct this filter.
Defect ID: 625538 was created to address this in a future version of Active Administrator.