- Kube-proxy handles Terminating EndpointSlices conditions and enables zero downtime deployments for Services with ExternalTrafficPolicy=Local author: @andrewsykim ([#117718](https://github.com/kubernetes/kubernetes/pull/117718), [@aojea](https://github.com/aojea)) [SIG Network, Testing and Windows]

* When HPAScaleToZero feature gate is enabled HPA supports scaling to zero pods based on object or external metrics. HPA remains active as long as at least one metric value available. ([#74526](https://github.com/kubernetes/kubernetes/pull/74526), [@DXist](https://github.com/DXist))
    * To downgrade the cluster to version that does not support scale-to-zero feature:

    * Old behavior:
      * environment variables explicitly whitelisted via --docker-env-metadata-whitelist were exported as `container_env_*=*`. Default is zero so by default non were exported
      * all docker labels were exported as `container_label_*=*`
    * New behavior:
      * Only `container_name`, `pod_name`, `namespace`, `id`, `image`, and `name` labels are exposed

yun

// zappos : 2015-06-25 Amazon Registry Services, Inc.
zappos

// zara : 2014-11-07 Industria de Diseño Textil, S.A. (INDITEX, S.A.)
zara

// zero : 2014-12-18 Amazon Registry Services, Inc.
zero

// zip : 2014-05-08 Charleston Road Registry Inc.
zip

// zone : 2013-11-14 Binky Moon, LLC
zone

// zuerich : 2014-11-07 Kanton Zürich (Canton of Zurich)

- The "fake" clients generated by `client-gen` now have the same semantics on
  error as the real clients; in particular, a failed Get(), Create(), etc, no longer
  returns `nil`. (It now returns a pointer to a zero-valued object, like the real
  clients do.) This will break some downstream unit tests that were testing
  `result == nil` rather than `err != nil`, and in some cases may expose bugs

* Fix load balancer issues when running zero nodes in Azure vmss. ([#68775](https://github.com/kubernetes/kubernetes/pull/68775), [@feiskyer](https://github.com/feiskyer))

pkg reflect, func NewAt(Type, unsafe.Pointer) Value
pkg reflect, func PtrTo(Type) Type
pkg reflect, func TypeOf(interface{}) Type
pkg reflect, func ValueOf(interface{}) Value
pkg reflect, func Zero(Type) Value
pkg reflect, method (*ValueError) Error() string
pkg reflect, method (ChanDir) String() string
pkg reflect, method (Kind) String() string
pkg reflect, method (StructTag) Get(string) string

- The `WaitFor` and `WaitForWithContext` functions in the wait package have now been marked private. Callers should use the equivalent `Poll*` method with a zero duration interval. ([#115116](https://github.com/kubernetes/kubernetes/pull/115116), [@smarterclayton](https://github.com/smarterclayton))

* Fixes an HPA-related panic due to division-by-zero. ([#39694](https://github.com/kubernetes/kubernetes/pull/39694), [@DirectXMan12](https://github.com/DirectXMan12))

### Certificates

* Change CollisionCount from int64 to int32 across controllers ([#50575](https://github.com/kubernetes/kubernetes/pull/50575), [@dixudx](https://github.com/dixudx))
* fix GPU resource validation that incorrectly allows zero limits ([#50218](https://github.com/kubernetes/kubernetes/pull/50218), [@dixudx](https://github.com/dixudx))