c8aeb9d672
file-hierarchy does not mention anything about the expected mountpoint for cgroups. This may lead some software to believe it will need to search for it (e.g. by scanning mountinfo) rather than just looking in the canonical location. Document the canonical mountpoint as /sys/fs/cgroup. Also provide information on the non-default configurations, but make it clear that in such configurations if cgroup2 is mounted (hybrid mode) it won't have resource controllers attached. This will help software know if it should fall back to /sys/fs/cgroup/unified or just ignore that case.
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