- LeaseLocks could now have custom labels that different holders would overwrite when they became the holder of the underlying lease. ([#131632](https://github.com/kubernetes/kubernetes/pull/131632), [@DerekFrank](https://github.com/DerekFrank))

* If you use the [GLBC Ingress Controller](https://github.com/kubernetes/ingress-nginx/tree/0.9.0-beta.1/controllers/gce),
  upgrading an existing pre-v1.6.4 cluster to Kubernetes v1.6.5 will cause an unintentional
  [overwrite of manual edits to GCP Health Checks](https://github.com/kubernetes/ingress/issues/842)
  managed by the GLBC Ingress Controller. This can cause the health checks to start failing,
  requiring you to reapply the manual edits.

* In the vSphere cloud provider the `Global.vm-uuid` configuration option is not deprecated anymore, it can be used to overwrite the VMUUID on the controller-manager ([#65152](https://github.com/kubernetes/kubernetes/pull/65152), [@alvaroaleman](https://github.com/alvaroaleman))

* Fix a bug in CRD openapi controller that user-defined CRD can overwrite OpenAPI definition/path for the CRD API. ([#81436](https://github.com/kubernetes/kubernetes/pull/81436), [@roycaihw](https://github.com/roycaihw))

- Kubeadm: Allow manually upgraded component configs to be supplied in a YAML file via the --config option during upgrade plan & apply. The old behavior of --config in which kubeadm configuration and component configs that overwrite everything cluster stored is preserved too. The behavior to use with --config is now determined based on whether kubeadm config API objects (API group "kubeadm.kubernetes.io") were supplied in the file or not. ([#91980](https://github.com/kubern...