## Changelog since v1.9.8

### Action Required

* ACTION REQUIRED: Kubernetes JSON deserializer is now case-sensitive to restore compatibility with pre-1.8 servers. If your config files contains fields with wrong case, the config files will be now invalid. ([#65298](https://github.com/kubernetes/kubernetes/pull/65298), [@nikhita](https://github.com/nikhita))

- Added the feature gates `StrictCostEnforcementForVAP` and `StrictCostEnforcementForWebhooks` to enforce the strict cost calculation for CEL extended libraries. It is strongly recommended to turn on the feature gates as early as possible. ([#124675](https://github.com/kubernetes/kubernetes/pull/124675), [@cici37](https://github.com/cici37)) [SIG API Machinery, Auth,...

- Added `SizeBasedListCostEstimate` feature gate that allowed apiserver to estimate sizes of objects to calculate cost of LIST requests. ([#132355](https://github.com/kubernetes/kubernetes/pull/132355), [@serathius](https://github.com/serathius)) [SIG API Machinery and Etcd]

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* wait until the pods are deleted completely ([#34778](https://github.com/kubernetes/kubernetes/pull/34778), [@ymqytw](https://github.com/ymqytw))
* AWS: recognize us-east-2 region ([#35013](https://github.com/kubernetes/kubernetes/pull/35013), [@justinsb](https://github.com/justinsb))

* The init-container (pod.beta.kubernetes.io/init-containers) annotations used to accept capitalized field names that could be accidentally generated by the k8s.io/kubernetes/pkg/api package. Using an upper case field name will now return an error and all users should use the versioned API types from `pkg/api/v1` when serializing from Golang.

## Action Required Before Upgrading

* Important Security-related changes before upgrading

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- Fix: consolidate logs for instance not found error (#105364, @nilo19) [SIG Cloud Provider]
- Fix: ignore not a VMSS error for VMAS nodes in EnsureBackendPoolDeleted. (#105404, @ialidzhikov) [SIG Cloud Provider]
- Fix: ignore the case when updating Azure tags (#104687, @nilo19) [SIG Cloud Provider]
- Revert PR #102925 which introduced unexpected scheduling behavior based on balanced resource allocation (#105239, @damemi) [SIG Scheduling]

   ([#122558](https://github.com/kubernetes/kubernetes/pull/122558), [@linxiulei](https://github.com/linxiulei))
- Fixed CEL estimated cost for expressions that perform operations on the result of `map()` operations (e.g., `.map(...).exists(...)` ) to have the correct estimated cost instead of an unbounded cost.
   ([#123562](https://github.com/kubernetes/kubernetes/pull/123562), [@jpbetz](https://github.com/jpbetz))

pkg flag, type Getter interface, Set(string) error
pkg flag, type Getter interface, String() string
pkg flag, var CommandLine *FlagSet
pkg go/ast, type SliceExpr struct, Max Expr
pkg go/ast, type SliceExpr struct, Slice3 bool
pkg go/ast, type TypeAssertExpr struct, Lparen token.Pos
pkg go/ast, type TypeAssertExpr struct, Rparen token.Pos
pkg go/build, method (*Context) MatchFile(string, string) (bool, error)