UserParameter=squid.filedesc.current,squidclient mgr:info |grep 'Number of file desc currently in use:'
UserParameter=squid.filedesc.max,squidclient mgr:info |grep 'Maximum number of file descriptors:'
UserParameter=squid.filedesc.curlargest,squidclient mgr:info |grep 'Largest file desc currently in use:'
UserParameter=squid.filedesc.avail,squidclient mgr:info |grep 'Available number of file descriptors:'