@vishh @davidopp @justinsb @bgrant0607 @gambol99 @dchen1107
#17265 and #16866 introduced region/zone labels.

I propose to move region/zone information to node.spec, instead of as a label, since this is the information which kubelet could get from cloud provider, just like ExternalID and ProviderID.

Make this information as label is flexible, but it will lead some updates and deletions related issue, see #18394

After all, if we make region/zone information a node label, why not make ExternalID and ProviderID as label, too?