feat: add nocgroup build tag for systems without cgroup #3948
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In restricted environments, for example some PaaS, there is limited/no access to Linux cgroups. This can cause the following panic:
To prevent this panic, this contribution adds support for a new go build tag
nocgroup
which will buildcore/stat/internal/cpu_other.go
instead ofcore/stat/internal/cpu_linux.go
.Example usage: