internal process user

Summary

How to find which process uses a certain internal user

Content

I am encountering an issue where thousands of contacts are being updated in a very short time, using an internal user that we created for itnegration purposes.

It's not clear which automatic process is using this user. I am assuming CPM, but can't be sure.

How can I find out which internal process is using that specific user for performing the updates? 

Version

20C