Werk #12307: add cgroup v2 support for docker and lxc

Component	Checks & agents
Title	add cgroup v2 support for docker and lxc
Date	Mar 11, 2021
Level	Trivial Change
Class	New Feature
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.1.0b1 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT 2.0.0p19 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

The check_mk_agent executed inside a docker or lxc container on a host with cgroup v2 enabled can now report metrics for cpu, memory and diskstat.

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