List all session variables?


I am quite new to Gatling, and to Scala for that matter, so maybe it is my lack of knowledge preventing me to solve this…
I have been looking for some time on how to dump the complete contents of all variables contained within a session.
Is there any way to achieve this?

Although it might be usefull to understand what variables I could have available to play with in my Objects, I was noew specifically looking for a an attribute that would contain a counter that indicates which user of e.g. atOnceUsers(2) is executing the scenario.
I need unique userids within my scenario’s, which I currently achieve via repeat(1,“scnCtr”) on the scenario, but it is counterintuitive, as a repetition of a scenario for me is a new session.