Why are my impressions populating in tail aggregate reporting?

This article discusses why you see tail aggregate impressions within our reporting dashboard

There is no negative connotation associated with Tail Aggregate Reporting. Due to a large number of sites campaigns bid on, our DSP doesn't have a quick way to share site reporting for all sites or push the data to our dashboard.

So, the solution to this is bucketing sites into "Tail Aggregate."

While there is often a high number of impressions labeled as "Tail Agg," these are simply sites with less than 200 bids per day. When impression goals are minimal, most of the site reporting will be in tail aggregate and should not be misconstrued as "re-labeled" for quality reasons.