rtkit cannot be silenced by changing log levels, or even by redirecting output to /dev/null. My /etc/systemd/system/rtkit-daemon.service.d/log.conf looks like this:
[Service] MaxLogLevel=3 StandardOutput=null StandardError=null ...and still rtkit writes reams of junk to the system log. Since it is a required dependency of some other software I have installed (flatpak, via xdg-desktop-portal), and something (perhaps pipewire or librewolf) auto-restarts it if you stop/disable it, there is no way to escape the hell that is rtkit supervising threads. I'm running a newly-installed Arch system, btw. Please help.