* kube-apiserver would return 400 Bad Request when it couldn't decode a json patch. ([#68346](https://github.com/kubernetes/kubernetes/pull/68346), [@CaoShuFeng](https://github.com/CaoShuFeng))
    * kube-apiserver would return 422 Unprocessable Entity when a json patch couldn't be applied to one object.

* fixes a validation error that could prevent updates to StatefulSet objects containing non-normalized resource requests ([#66165](https://github.com/kubernetes/kubernetes/pull/66165), [@liggitt](https://github.com/liggitt))

* Only use the first IP address got from instance metadata. This is because Azure CNI would set up a list of IP addresses in instance metadata, while only the first one is the Node's IP. ([#71736](https://github.com/kubernetes/kubernetes/pull/71736), [@feiskyer](https://github.com/feiskyer))

*   Custom resources served by CustomResourceDefinition objects now support field selectors for `metadata.name` and `metadata.namespace`. Also fixed an issue with watching a single object; earlier versions could watch only a collection, and so a watch on an instance would fail.  ([#53345](https://github.com/kubernetes/kubernetes/pull/53345),[ @ncdc](https://github.com/ncdc))

#### **Other**

- Fixed bug in reflector that couldn't recover from `Too large resource version` errors with API servers before 1.17.0. ([#115093](https://github.com/kubernetes/kubernetes/pull/115093), [@xuzhenglun](https://github.com/xuzhenglun))

## Changes by Kind

### API Change

 
## Changes by Kind

### API Change

* Fixes issue where you could not mount NFS or glusterFS volumes using hostnames on GCI/GKE with COS images. ([#42376](https://github.com/kubernetes/kubernetes/pull/42376), [@jingxu97](https://github.com/jingxu97))

- Fixed issue where kubectl-convert would fail when encountering resources that could not be converted to the specified api version. New behavior is to warn the user of the failed conversions...

- Fixed a bug in the single-numa-node policy of the TopologyManager.  Previously, pods that only requested CPU resources and did not request any third-party devices would fail to launch with a TopologyAffinity error. Now they will launch...