* Check if container memory stats are available before accessing it ([#77656](https://github.com/kubernetes/kubernetes/pull/77656), [@yastij](https://github.com/yastij))
* client-go and kubectl no longer write cached discovery files with world-accessible file permissions ([#77874](https://github.com/kubernetes/kubernetes/pull/77874), [@yuchengwu](https://github.com/yuchengwu))

* Fix serialization of EnforceNodeAllocatable ([#44606](https://github.com/kubernetes/kubernetes/pull/44606), [@ivan4th](https://github.com/ivan4th))
* Add --write-config-to flag to kube-proxy to allow users to write the default configuration settings to a file. ([#45908](https://github.com/kubernetes/kubernetes/pull/45908), [@ncdc](https://github.com/ncdc))

- Server Side Apply now treats LabelSelector fields as atomic (meaning the entire selector is managed by a single writer and updated together), since they contain interrelated and inseparable fields that do not merge in intuitive ways. ([#93901](https://github.com/kubernetes/kubernetes/pull/93901), [@jpbetz](https://github.com/jpbetz)) [SIG API Machinery, Auth, CLI,...

- CRD deep copies should no longer contain shallow copies of `JSONSchemaProps.XValidations`. ([#107956](https://github.com/kubernetes/kubernetes/pull/107956), [@benluddy](https://github.com/benluddy))

- When using `kubectl replace` (or the equivalent API call) on a Service, the caller no longer needs to do a read-modify-write cycle to fetch the allocated values for `.spec.clusterIP` and `.spec.ports[].nodePort`.  Instead the API server will automatically carry these forward from the original object when the new object does not specify them. ([#104673](https://github.co...

* Fix a scalability issue where high rates of event writes degraded etcd performance. ([#64539](https://github.com/kubernetes/kubernetes/pull/64539), [@ccding](https://github.com/ccding))

    * inside of which a write lock was intended to prevent races against
    * VM creation, but the usage of the sync.RWMutex type is incorrect,
    * plus is placed in a defer call so the locking is effectively
    * nonexistent.  This patch adds an anonymous function call inside
    * the loop to correctly handle acquiring the write lock with deferred

- Fixes creationTimestamp: null causing unnecessary writes to etcd ([#116865](https://github.com/kubernetes/kubernetes/pull/116865), [@alexzielenski](https://github.com/alexzielenski)) [SIG API Machinery and Testing]

- client-go and kubectl no longer write cached discovery files with world-accessible file permissions. ([#77874](https://github.com/kubernetes/kubernetes/pull/77874), [@yuchengwu](https://github.com/yuchengwu))

egress rules; policies that contain an egress section are assumed to affect egress, and all policies (whether or not they contain an ingress section) are assumed to affect ingress. If you want to write an egress-only policy, you must explicitly specify policyTypes [ \"Egress\" ]. Likewise, if you want to write a policy that specifies that no egress is allowed, you must specify a policyTypes value that include \"Egress\" (since such a policy would not include an egress section and would otherwise default...