* Improve our Instance Metadata coverage in Azure. ([#49237](https://github.com/kubernetes/kubernetes/pull/49237), [@brendandburns](https://github.com/brendandburns))

- Increased the coverage to 89.8%. ([#132607](https://github.com/kubernetes/kubernetes/pull/132607), [@ylink-lfs](https://github.com/ylink-lfs))

* Implement kubectl rollout undo and history for DaemonSet ([#46144](https://github.com/kubernetes/kubernetes/pull/46144), [@janetkuo](https://github.com/janetkuo))
* Respect PDBs during node upgrades and add test coverage to the ServiceTest upgrade test. ([#45748](https://github.com/kubernetes/kubernetes/pull/45748), [@mml](https://github.com/mml))

### Other notable announcements

SIG Network is moving IPv6 to Beta in Kubernetes 1.18, after incrementing significantly the test coverage with new CI jobs.

#### Continuous Improvement
- Project sustainability is not just about features. Many SIGs have been working on  improving test coverage, ensuring the basics stay reliable, and stability of the core feature set and working on maturing existing features and cleaning up the backlog.

#### Extensibility

- Hack/update-codegen.sh now automatically ensured goimports and protoc. ([#131459](https://github.com/kubernetes/kubernetes/pull/131459), [@BenTheElder](https://github.com/BenTheElder))
- Increased test coverage for kubelet package to 92.3%. ([#132484](https://github.com/kubernetes/kubernetes/pull/132484), [@ylink-lfs](https://github.com/ylink-lfs))

- This PR will leverage subtests on the existing table tests for the scheduler units. ([#63665](https://github.com/kubernetes/kubernetes/pull/63665), [@xchapter7x](https://github.com/xchapter7x))

- Scheduler volumebinding: leverage PreFilterResult to reduce down to only eligible node(s) for pod with bound claim(s) to local PersistentVolume(s) ([#109877](https://github.com/kubernetes/kubernetes/pull/109877), [@yibozhuang](https://github.com/yibozhuang)) [SIG Scheduling, Storage...

- The kubeconfig is now exposed in `the kube-scheduler` framework handle. Out-of-tree plugins can leverage that to build CRD informers easily. ([#100644](https://github.com/kubernetes/kubernetes/pull/100644), [@Huang-Wei](https://github.com/Huang-Wei))

  `sync_partial_proxy_rules_duration_seconds` (in addition to the existing\n`sync_proxy_rules_duration_seconds`),
  giving better information about the duration of each \nsync type, rather than
  only giving a weighted average of the two sync types together. ([#117787](https://github.com/kubernetes/kubernetes/pull/117787), [@danwinship](https://github.com/danwinship))
- `kubeadm`: added a new "kubeadm config validate" command that can be used to