Deskpro uses a cron job or Windows Scheduled Task to carry out scheduled tasks that need to happen on a regular basis - for example, checking for new emails every minute.
You can see these from the admin interface at Server > Scheduled Tasks.
If you find that cron/Scheduled Task is crashing and you want to investigate, you can enable logging by adding this to the
$DP_CONFIG['debug']['write_cron_logfile'] = 1;
When cron runs, debug information will be appended to data/logs/cron.log
Since scheduled tasks run so often, this file can get large quite quickly. You should either rotate this file, or remember to disable logging once you’ve solved the problem.