[systemd-devel] how to set net_cls.classid cgroups argument for a service?

[Andrew Gurinovich]

What is the recommended way to assign cgroups prop net_cls.classid to a
systemd service?
Seems that a rule of thumb that whatever service property that is supposed
to be systemd-managed, got a property in service file. However,
https://systemd.io/CGROUP_DELEGATION says that:

>>This means systemd currently does not and will never manage the following
controllers on cgroup v1: freezer, cpuset, net_cls, perf_event, net_prio,
hugetlb.

Do It mean I'm on my own and need to write a custom ExecStartPost shell
script to handle cgroups creation and cleanup myself just to change a
single cgroup argument?

vers:
centos7, systemd 219(old, but thats all that centos/rhel7 offers), cgroups
v1
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