# /etc/systemd/system/muahao.timer[Unit]Description=testDocumentation=man:test[Timer]OnBootSec=1minOnUnitActiveSec=10sAccuracySec=10msUnit=muahao.service[Install]WantedBy=multi-user.target# /etc/systemd/system/muahao.service[Unit]Description=/tmp/muahao path monitorConditionFileIsExecutable=/usr/libexec/muahao.sh[Service]Type=simpleExecStart=/usr/libexec/muahao2.shDelegate=noSlice=mumumu.sliceWhen I use this 2 options:Delegate=no, Slice=mumumu.slice and then mkdir /sys/fs/cgroup/memory/mumumu.slice/muahao.service/bbb, bbb/tasks is empty ,/sys/fs/cgroup/memory/mumumu.slice/muahao.service/bb will never been cleanedWhen I use this 2 options:Delegate=yes, Slice=mumumu.slice and then mkdir /sys/fs/cgroup/memory/mumumu.slice/muahao.service/bbb, bbb/tasks is empty ,/sys/fs/cgroup/memory/mumumu.slice/muahao.service/bb will been cleaned!Is this behavior logical in systemd?what Delegate=yes mean? 
systemd clean empty cgroup dirs when used Delegate=yes?
systemd