* Add ClusterUpgrade tests ([#24150](https://github.com/kubernetes/kubernetes/pull/24150), [@ihmccreery](https://github.com/ihmccreery))
* Trusty: Do not create the docker-daemon cgroup ([#23996](https://github.com/kubernetes/kubernetes/pull/23996), [@andyzheng0831](https://github.com/andyzheng0831))



# v1.2.2

- When specifying `--(kube|system)-reserved-cgroup`, with `--cgroup-driver=systemd`, it is now possible to use the fully qualified cgroupfs name (i.e. `/test-cgroup.slice`). ([#78793](https://github.com/kubernetes/kubernetes/pull/78793), [@mattjmcnaughton](https://github.com/mattjmcnaughton))

### SIG Node

- Fixed a bug in previous releases where a pod could be placed inside another pod's cgroup when specifying --cgroup-root ([#70678](https://github.com/kubernetes/kubernetes/pull/70678), [@dashpole](https://github.com/dashpole))

- Promoted CRI communication of the cgroup driver mechanism to beta. The `KubeletCgroupDriverFromCRI` feature gate is now in beta and enabled by default. This allows the kubelet to query the container runtime using CRI to determine the mechanism for cgroup management. If the container runtime doesn't support this, the kubelet falls back to using the configuration file (you can also use the deprecated `--cgroup-driver` command line argument). ([#125828](https://github.com...

### Bug or Regression

- Bump system-validators to v1.10.2: remove version-specific cgroup kernel config checks to avoid false failures on cgroup v2 systems when v1-only configs are missing. ([#134087](https://github.com/kubernetes/kubernetes/pull/134087), [@pacoxu](https://github.com/pacoxu)) [SIG Cluster Lifecycle]

* Fixes a bug in previous releases where a pod could be placed inside another pod's cgroup when specifying --cgroup-root ([#70678](https://github.com/kubernetes/kubernetes/pull/70678), [@dashpole](https://github.com/dashpole))

  Fixed skip `not found` nodes when reconciling LB backend address pools ([#105188](https://github.com/kubernetes/kubernetes/pull/105188), [@nilo19](https://github.com/nilo19))
- Fixed occasional pod cgroup freeze when using cgroup v1 and systemd driver. ([#104528](https://github.com/kubernetes/kubernetes/pull/104528), [@kolyshkin](https://github.com/kolyshkin))

- Kubeadm: get k8s CI version markers from k8s infra bucket ([#98836](https://github.com/kubernetes/kubernetes/pull/98836), [@hasheddan](https://github.com/hasheddan)) [SIG Cluster Lifecycle and Release]
- Kubelet should ignore cgroup driver check on Windows node. ([#98385](https://github.com/kubernetes/kubernetes/pull/98385), [@pacoxu](https://github.com/pacoxu)) [SIG Node]

* Default resourceGroup should be used when the value of annotation azure-load-balancer-resource-group is an empty string. ([#79514](https://github.com/kubernetes/kubernetes/pull/79514), [@feiskyer](https://github.com/feiskyer))
* Remove pids cgroup controller requirement when related feature gates are disabled ([#79073](https://github.com/kubernetes/kubernetes/pull/79073), [@rafatio](https://github.com/rafatio))

* Fix SessionAffinity not updated issue for Azure load balancer ([#64180](https://github.com/kubernetes/kubernetes/pull/64180), [@feiskyer](https://github.com/feiskyer))
* Fixes a hang on kubelet startup when using systemd cgroup driver of libcontainer. ([#61926](https://github.com/kubernetes/kubernetes/pull/61926), [@filbranden](https://github.com/filbranden))