Depending on the log level setting (error, warn, info, debug) in the configuration file factory.ini the size of the Debug Log, usually $SCHEDULER_DATA/logs/scheduler.log, will grow more or less fast. To limit the size of the Debug Log it is recommended that you run the housekeeping job JobSchedulerRotateLog on a regular basis, e.g. daily.
The JobSchedulerRotateLog job rotates the Debug Log and Main Log, i.e. the current content will be saved to a zipped file (marked with a timestamp) and the the content of the Debug Log will be deleted.