Jason Tedor 900ee0536e Strengthen handling of unavailable cgroup stats
On some systems, cgroups will be available but not configured. And in
some cases, cgroups will be configured, but not for the subsystems that
we are expecting (e.g., cpu and cpuacct). This commit strengthens the
handling of cgroup stats on such systems.

Relates #21094
2016-10-24 16:36:51 -04:00
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