- Fixes the bug when images pinned by the container runtime can be garbage collected by kubelet ([#119986](https://github.com/kubernetes/kubernetes/pull/119986), [@ruiwen-zhao](https://github.com/ruiwen-zhao)) [SIG Node]
- Fixing issue with incremental id generation for loadbalancer and endpoint in Kubeproxy mock test framework. ([#120723](https://github.com/kubernetes/kubernetes/pull/120723), [@princepereira](https://github.com/princepereira)) [SIG Network and Windows]

- Using `--log-file` is known to be problematic in 1.15. This presents as things being logged multiple times to the same file. The behaviour and details of this issue, as well as some preliminary attempts at fixing it are documented [here](https://github.com/kubernetes/kubernetes/issues/78734#issuecomment-501372131)

## Urgent Upgrade Notes

### (No, really, you MUST read this before you upgrade)

#### API Machinery

* Increase allowed lag for ssh key sync loop in tunneler to allow for one failure ([#60068](https://github.com/kubernetes/kubernetes/pull/60068), [@wojtek-t](https://github.com/wojtek-t))
* Fixing a bug in OpenStack cloud provider, where dual stack deployments (IPv4 and IPv6) did not work well when using kubenet as the network plugin. ([#59749](https://github.com/kubernetes/kubernetes/pull/59749), [@zioproto](https://github.com/zioproto))

- Fixes an issue calculating total CPU usage reported for Windows nodes ([#122999](https://github.com/kubernetes/kubernetes/pull/122999), [@marosset](https://github.com/marosset)) [SIG Node and Windows]

### Bug or Regression

- Bump sigs.k8s.io/apiserver-network-proxy/konnectivity-client to v0.0.30, fixing goroutine leaks in kube-apiserver. ([#108439](https://github.com/kubernetes/kubernetes/pull/108439), [@andrewsykim](https://github.com/andrewsykim)) [SIG API Machinery, Auth and Cloud Provider]

- Fixed bug that caused cAdvisor to incorrectly detect single-socket multi-NUMA topology. ([#99207](https://github.com/kubernetes/kubernetes/pull/99207), [@iwankgb](https://github.com/iwankgb)) [SIG Node]
- Fixing a bug where a failed node may not have the NoExecute taint set correctly ([#98168](https://github.com/kubernetes/kubernetes/pull/98168), [@CKchen0726](https://github.com/CKchen0726)) [SIG Apps and Node]