I'm wondering if Jitsi Videobridge detects and reports that media streams from a given participant are not available anymore? If so, what kind of XMPP message is sent in this case? I guess, the bridge can detect it as it observes activity/lack of activity over the RTP channel.
The scenario could be e.g. that user's browser has crashed and I'd like to notify other participants that this user has left the conference/not available at the moment.