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You could tweak your logrotate settings to rotate more often and delete files older than specified amount of days…
Have a look at /etc/logrotate.conf and /etc/logrotate.d/rsyslog -
You could also modify the service file
/etc/systemd/system/qmi_reconnect.service
And send standard error and/or standard output to where nobody cares about it:
StandardOutput=null
StandardError=null
The spamming probably comes from StandardError so just sending that to null might suffice.
Note: make sure you do a…
systemctl daemon-reload
After you have modified service files.