/var/log/syslog

gistfile1.txt

# litd Log File

litd is logging to /var/log/syslog

Logrotate is a linux system utility that by default runs once per day, and will trim (rotate) your log files if configured to do so. It will also keep a configurable
number of previous log files but will compress them to save a considerable about of disk space.  Compressed files have the .gz extension.

If once a day isn't frequent enough it can be configured to run as often as you'd like by editing the systemd logrotate.timer configuration. We won't cover that here,
and if once a day isn't enough you can also configure the verbosity level of the service that is being too chatty. 

By default logrotate is rotating /var/log/syslog and others once a week,  can be adjusted if its filling up drive.
can be configured to rotate based on duration (days, weeks, months) or by size (10MB)

Edit the /etc/logrotate.d/rsyslog file and adjust as follows, or consult the logrotate documentation to customize to your requirements.
# sudo nano /etc/logrotate.d/rsyslog

/var/log/syslog
{
        rotate 4
        weekly
        size 50M
        missingok
        notifempty
        compress
        delaycompress
        sharedscripts
        postrotate
                /usr/lib/rsyslog/rsyslog-rotate
        endscript
}

# If you want to modify the verbosity level of lnd
# The available debug levels are, in order of descending detail: trace, debug, info, warn, error, critical, off
# nano ~/.lit/lit.conf

lnd.debuglevel=info

# If logrotate running once a day is too infrequent, it can be adjusted as follows to run every 30 minutes
# sudo nano /etc/systemd/system/timers.target.wants/logrotate.timer

OnCalendar=*:0/30:0

# systemctl daemon-reload
# systemctl restart logrotate.timer