pod-overhead: add Overhead to PodSpec and RuntimeClass #76968
What type of PR is this?
What this PR does / why we need it:
Addition of overhead field to the PodSpec as part of the API changes described in the Pod Overhead KEP
Does this PR introduce a user-facing change?:
tallclair left a comment
If the PodOverhead feature is not enabled, the overhead field needs to be dropped. See https://github.com/kubernetes/kubernetes/blob/master/pkg/api/pod/util.go#L283
I also think it makes sense to add the RuntimeClass API in the same PR, since those fields are intrinsically linked.
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