Handle cgroups v2 in OsProbe (#77128)
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Closes elastic#76812. Closes elastic#77126. OsProbe was only capable of handle cgroup data in the v1 format. However, Debian 11 uses cgroups v2 by default, and Elasticsearch isn't capable of reporting any cgroup information. Therefore, add support for the v2 layout. Note that we have to open access to all of /sys/fs/cgroup because with cgroups v2, the files we need are in an unpredictably location.
* Handle a max memory value of 'max' * Update docs/changelog/77289.yaml * Delete 77289.yaml
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Backport of #77128 and #77289.
Closes #76812. Closes #77126.
OsProbe was only capable of handle cgroup data in the v1 format.
However, Debian 11 uses cgroups v2 by default, and Elasticsearch isn't
capable of reporting any cgroup information. Therefore, add support for
the v2 layout.
Note that we have to open access to all of
/sys/fs/cgroupbecause withcgroups v2, the files we need are in an unpredictably location.