Only change QOS(prefetch_count) if it has changed
Only change QOS(prefetch_count) if it has changed

ask/celery,mitsuhiko/celery,WoLpH/celery,frac/celery,mitsuhiko/celery,cbrepo/celery,WoLpH/celery,cbrepo/celery,frac/celery,ask/celery