How many open file descriptors do relay and signaling server use per connected peer?

[MichaIng]

The systemd units of the deb packages set LimitNOFILE=1000000, which is VERY high. Even on modern systems, the hard limit is usually at 524288, the default at 1024, e.g. since the select syscall does not work with higher values.

Hence I am wondering how many open files to expect on a self-hosted instance, and also whether the signaling server keeps them open after the peers connected via P2P or relay server, or whether it disconnects after the peers have established a connection with each other?

Of course I do understand that RustDesk's own public servers must allow such numbers of connections, hence raised limits.