`PersistentVolumes` with topology labels, now does not overwrite existing labels on PVs that were dynamically provisioned. It trusts the  dynamic provisioning that it provided the correct labels to the `PersistentVolume`, saving one potentially expensive cloud API call. `PersistentVolumes` created manually by users are labelled by the admission plugin in the same way as before. ([#82830](https://github.com/kubernetes/kubernetes/pull/82830), [@jsafrane](https://github.com/jsafrane))

-...

* Fixes a flaw (CVE-2019-11253) in json/yaml decoding where large or malformed documents could consume excessive server resources. Request bodies for normal API requests (create/delete/update/patch operations of regular resources) are now limited to 3MB. ([#83261](https://github.com/kubernetes/kubernetes/pull/83261), [@liggitt](https://github.com/liggitt))...

- **Overhauled metrics**: Kubernetes has previously made extensive use of a global metrics registry to register metrics to be exposed. By implementing a metrics registry, metrics are registered in more transparent means. Previously, Kubernetes metrics have been excluded from any kind of stability requirements.

* A pod’s Quality of Service Class is now available in its Status.
* Upgrade cAdvisor library to v0.25.0. Notable changes include,
  - Container filesystem usage tracking disabled for device mapper due to excessive
    IOPS.
  - Ignore `.mount` cgroups, fixing disappearing stats.
* A new field `terminationMessagePolicy` has been added to containers that allows

- Reduced excessive logging in the Volume Binding scheduler plugin by lowering the verbosity of high-frequency messages from `V(4)` to `V(5)`. ([#132840](https://github.com/kubernetes/kubernetes/pull/132840), [@ppmechlinski](https://github.com/ppmechlinski)) [SIG Autoscaling,...

- Reduced the number of cloud API calls and service downtime caused by excessive re-configurations of cluster LBs with externalTrafficPolicy=Local when node readiness changes (https://github.com/kubernetes/kubernetes/issues/111539). The service controller (in cloud-controller-manager) will avoid resyncing nodes which are transitioning...

- Fixed a bug where improper storage and comparison of endpoints led to excessive API traffic from the endpoints controller ([#94112](https://github.com/kubernetes/kubernetes/pull/94112), [@damemi](https://github.com/damemi)) [SIG Apps, Network and Testing]

* Fixes a flaw (CVE-2019-11253) in json/yaml decoding where large or malformed documents could consume excessive server resources. Request bodies for normal API requests (create/delete/update/patch operations of regular resources) are now limited to 3MB. ([#83261](https://github.com/kubernetes/kubernetes/pull/83261), [@liggitt](https://github.com/liggitt))...

* Fixes a flaw (CVE-2019-11253) in json/yaml decoding where large or malformed documents could consume excessive server resources. Request bodies for normal API requests (create/delete/update/patch operations of regular resources) are now limited to 3MB. ([#83261](https://github.com/kubernetes/kubernetes/pull/83261), [@liggitt](https://github.com/liggitt))...

### Other notable changes

* Fix gpu issue after node instance recreation in 1.10. ([#69595](https://github.com/kubernetes/kubernetes/pull/69595), [@jiayingz](https://github.com/jiayingz))
* Reduced excessive logging from fluentd-gcp-scaler. ([#68837](https://github.com/kubernetes/kubernetes/pull/68837), [@x13n](https://github.com/x13n))