Hi and a good week!
First - here is the link to the issue I've sent last week on the Google Mobile Ads SDK Developers Forum.
https://groups.google.com/g/google-admob-ads-sdk/c/v8cgT-ogJ9cI was directed to this forum by our Admob account manager Bogdina Buvaeva.
My name is Itay Kohay and I work as a monetization manager at ''Dramton. We are using Admob mediation for our "Squishy Magic" iOS & Android Apps.
About one month ago - 14.2.2021, Admob stopped getting eCPM and Revenue information from one of our Ad Sources "
Ad Colony" as you can see below.

The problem is probably reporting related as we can see AdColony certainly gets some of the impression and according to their internal stats there is eCPM floors and revenue -

"
We will really appreciate your help in resolving this issue.
Best regards