Via https://github.com/knative/serving/issues/7300

The upstream 0.27 (potentially 1.0) release is starting to deprecate camelCased config map keys in favor of kebab-cased ones. There'll be a deprecation period, so customers can react to this change. We should make sure to adjust out docs in time and announce the change via a release-note so that customers know what they'll have to do.