- Extend discovery GroupManager with Group lister interface ([#127524](https://github.com/kubernetes/kubernetes/pull/127524), [@mjudeikis](https://github.com/mjudeikis)) [SIG API Machinery]
- Fixed: Avoid overwriting in-pod vertical scaling updates on systemd daemon reloads when using systemd ([#124216](https://github.com/kubernetes/kubernetes/pull/124216), [@iholder101](https://github.com/iholder101)) [SIG Node]

* kube-proxy needs to be configured to override hostname in some environments. ([#857](https://github.com/kubernetes/kubeadm/issues/857), [@detiber](https://github.com/detiber))
* There's a known issue where the Vertical Pod Autoscaler will radically change implementation in 1.12, so users of VPA (alpha) in 1.11 are warned that they will not be able to automatically migrate their VPA configs from 1.11 to 1.12.


## Before Upgrading

}\n\n  const placement = data.placement.split('-')[0];\n  const { popper, reference } = data.offsets;\n  const isVertical = ['left', 'right'].indexOf(placement) !== -1;\n\n  const len = isVertical ? 'height' : 'width';\n  const sideCapitalized = isVertical ? 'Top' : 'Left';\n  const side = sideCapitalized.toLowerCase();\n  const altSide = isVertical ? 'left' : 'top';\n  const opSide = isVertical ? 'bottom' : 'right';\n  const arrowElementSize = getOuterSizes(arrowElement)[len];\n\n  //\n  // extends keepTogether...