Frontend span attribute app.session.id gone

[julianocosta89]

Bug Report

Which version of the demo you are using? (please provide either a specific
603af36

Symptom

It seems that the span attribute app.session.id is not available anymore in the demo.

What is the expected behavior?

Either update the docs to remove the app.session.id from the list of custom attributes, or ideally, add the span attribute back.

[disfluxly]

I'd definitely prefer that it be added back instead of removing it from the docs, since the Session ID is displayed on the bottom of the GUI pages. Made it really easy to walk someone through a demo and see all of the traces they made.