Another question (and sorry if i’m spamming - new around here!) - is there a best practice for running a test where something other than a user determines the exposure? in my case, we are testing a variations of a widget, but a single user may see a different variation per session. i want to test the performance of each variation (based on some conversion metric). My initial thinking is that I can instead make the session_id be the user_id: so each session is bucketed instead of users.

you can use session id as the randomization unit