Lemmy logs everything, and I mean everything. I haven’t found a setting to dial it back so I’ve banned it from writing to syslog and moved journal to memory only. Here is what I ran to stop it from filling up my disk with logs.

echo 'if $programname == "lemmy_server" then stop' >> /etc/rsyslog.d/ignore-lemmy_server.conf
systemctl restart rsyslog

sed -i 's/#SystemMaxUse=/SystemMaxUse=25M/g' /etc/systemd/journald.conf
sed -i 's/#Storage=auto/Storage=volatile/g' /etc/systemd/journald.conf systemctl restart systemd-journald