Kir Kolyshkin f1aee7e049 kubelet/cm: GetResourceStats -> MemoryUsage ...

Commit cc50aa9dfb introduced GetResourceStats, a method which collected
all the statistics from various cgroup controllers, only to discard all
of the info collected except a single value (memory usage).

While one may argue that this method can potentially be used from other
places, this did not happen since it was added 4+ years ago.

Let's streamline this code and only collect what we need, i.e. memory
usage. Rename the method accordingly.

While at it, fix pkg/kubelet/cm/cgroup_manager_unsupported.go to not
instantiate a new error every time a method is called.

Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>

2021-05-23 20:43:52 -07:00

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