It feels like we ought to have a log_cleaner.py that takes parameters telling it what logs to clean (and the size limit), and we would run two instances on a box with box Bono and Sprout installed - eg. log_cleaner.py 1000000 /var/log/sprout sprout*.log log*.log.  That would also give us the option of running two instances on Sprout (for instance) if we wanted different limits for debug and analytics logs.