How to detect user disconnection?

I'm creating a 1v1 challenge using realtime and i want to trigger a function when the user disconnect... how to make this using Appwrite Realtime?

i searched in the docs for anything related to the disconnection and i didn't fined anything.

TL;DR

Developers are looking for a way to detect user disconnection in a 1v1 challenge using Appwrite Realtime. The documentation does not provide information on this specific topic.