Not sure I follow, can expand on that? I gave a presentation on it recently https://www.youtube.com/watch?v=BuSpMvVU7j4 which goes over demos and implementation details if you are interested in those topics.

I meant this [0], and so tracking a data via tagging it with a metadata and seeing where it ends up.

Thanks for the video, I'm gonna go watch it.

[0[: https://clojure.org/reference/metadata

So recording in FlowStorm doesn't use Clojure metadata capabilities in any way, it is basically about storing function calls, function returns and the pointers to all expressions intermediate immutable values together with their code coordinates.