BUG: Mk_docker and Proxmox agent broken on cgroupv2 environments (container level): "Parsing of section docker_container_mem failed"

I can confirm that by configuring my Debian 11 system to use the legacy cgroup hierarchy / cgroupv1 the checks are working again. The containers still run as expected, I will leave it at that and wait for version 2.1 and change it back then.