PIS stands for "Programmatic Impressions Served"
Why is PIS Important?
Programmatic Impressions Served (PIS) is the number of impressions shown to site visitors through the Sulvo ad unit container. PIS includes impressions from all special connectors.
Please note that PIS will not match your site Page Views due to the fact that you will not receive PIS for "no revenue impressions" (such as impressions with 0% viewability that do not bring earnings), blocked bots, or ad blocked impressions.
What if PIS is blank or very low?
If you have placed ad tags on a site but PIS for all ad units on the site are blank and there no earnings for the site on the dashboard, then you may have an ads.txt issue or ads.txt has not yet replicated to demand sources (this can take 24 hours or more). Please see "Settings-->Ads.txt" to remedy this issue.
If you see PIS but orders of magnitude (think 2-5x lower) lower than the site Page Views, then you may have an implementation issue. Please see the "Problematic Implementations" help center article.