From #45857.

We were trying to remove ExternalTrafficLocalOnly from kube feature gates as that feature is going to GA in v1.7 and we don't want users to disable it. Though removing that entry breaks the deprecation policy, which says flags have to have a deprecation window.

As what #45857 (comment) suggests, we should have a proper way to deprecate feature gates. Open this issue for further discussion.

@kubernetes/sig-api-machinery-feature-requests
cc @thockin @caesarxuchao