Browser Sessions
A replay shows you what the user did. The trace under it shows you why it failed. Both carry the same session id, so the jump between them is one click, not a reconstruction.
The surface
The viewport plays back exactly as rendered, with console lines, network requests and thrown exceptions on the same timeline as the clicks that caused them.

In motion
The cursor travels to Pay now, the click lands, and the event stream fills in beside it — each entry carrying the trace id it belongs to.
What it does
One endpoint, one key. Traces, logs, metrics and sessions land on the same trace id from the first request.