- Limits lease to have 1000 maximum attached objects. ([#98257](https://github.com/kubernetes/kubernetes/pull/98257), [@lingsamuel](https://github.com/lingsamuel))

Cluster administrators will be able to place limits by using the new kubelet command line parameter --pod-max-pids. Note that since this is a alpha feature they will need to enable the "SupportPodPidsLimit" feature. By default, we do not set any maximum limit, If an administrator wants to enable this, they should enable SupportPodPidsLimit=true in the --feature-gates= parameter to kubelet and specify the limit using the --pod-max-pids parameter. The limit set is the total count of all processes running...

### Bug or Regression

- Fixed a bug where a high churn of events was causing master instability by reducing the maximum number of objects (events) attached to a single etcd lease. ([#100452](https://github.com/kubernetes/kubernetes/pull/100452), [@mborsz](https://github.com/mborsz)) [SIG API Machinery and Instrumentation]

*   The Go version was upgraded from go1.8.3 to **go1.9.2** ([#51375](https://github.com/kubernetes/kubernetes/pull/51375),[ @cblecker](https://github.com/cblecker))
    *   The minimum supported go version bumps to 1.9.1. ([#55301](https://github.com/kubernetes/kubernetes/pull/55301),[ @xiangpengzhao](https://github.com/xiangpengzhao))

* [Federation][kubefed]: Use StorageClassName for etcd pvc ([#46323](https://github.com/kubernetes/kubernetes/pull/46323), [@marun](https://github.com/marun))
* Restrict active deadline seconds max allowed value to be maximum uint32 ([#46640](https://github.com/kubernetes/kubernetes/pull/46640), [@derekwaynecarr](https://github.com/derekwaynecarr))

- Made Job controller batching of syncJob invocations enabled unconditionally (it was conditional on JobReadyPods feature before).

- The default Go version was updated to 1.11.2. ([#70665](https://github.com/kubernetes/kubernetes/pull/70665))
- The minimum supported Go version was updated to 1.11.2 ([#69386](https://github.com/kubernetes/kubernetes/pull/69386))
- CNI is unchanged at v0.6.0 since Kubernetes 1.10 ([#51250](https://github.com/kubernetes/kubernetes/pull/51250))

  fix some problems, eg with HostPorts. ([#94474](https://github.com/kubernetes/kubernetes/pull/94474), [@danwinship](https://github.com/danwinship)) [SIG Network and Node]
- Increase maximum IOPS of AWS EBS io1 volume to current maximum (64,000). ([#90014](https://github.com/kubernetes/kubernetes/pull/90014), [@jacobmarble](https://github.com/jacobmarble))

- Added the `disable-force-detach` CLI option for `kube-controller-manager`. By default, it's set to `false`. When enabled, it prevents force detaching volumes based on maximum unmount time and node status. If activated, the non-graceful node shutdown feature must be used to recover from node failure. Additionally, if a pod needs to be forcibly terminated at the risk of corruption, the appropriate VolumeAttachment object...

- The kube-proxy image contains `/go-runner` as a replacement for deprecated klog flags. ([#106301](https://github.com/kubernetes/kubernetes/pull/106301), [@pohly](https://github.com/pohly))
- The maximum length of the `CSINode` id field has increased to 256 bytes to match the CSI spec. ([#104160](https://github.com/kubernetes/kubernetes/pull/104160), [@pacoxu](https://github.com/pacoxu))