The upstream YAML for kube-proxy-ds uses a nodeSelector: ` 
beta.kubernetes.io/kube-proxy-ds-ready: "true" 
` 
(https://github.com/kubernetes/kubernetes/blob/master/cluster/addons/kube-proxy/kube-proxy-ds.yaml#L30:9)

Where is this nodeSelector documented? How do installer authors know that 
they need to place this label on nodes? (Or is this a label that is placed 
on nodes by some other k8s component?)

https://github.com/kubernetes/kubernetes/blob/master/cluster/addons/kube-proxy/kube-proxy-ds.yaml#L30:9

I'm concerned because I'd never seen it before, and comments found on 
Google when searching for the label value indicates that it's important for 
rolling-upgrade scenarios for kube-proxy.

Thanks.

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