I love to see more activity in this area!

I'm maintainer of GoReplay https://github.com/buger/goreplay and work in this area for the last 10 years.

It is quite hard problem to solve, because you have to deal with state difference between test and production environments. Love your approach to mocking dependencies, and leveraging OpenTelementry. It potentially can solve some of state issues. But still require modifying user code. I wonder if it can be done purely using OpenTelementry (e.g. you depend on typical OTel setup), and then read the data directly from OTel DB.

Cheers!