- Base-images: Update to debian-iptables:buster-v1.4.0
  - Uses iptables 1.8.5
  - base-images: Update to debian-base:buster-v1.3.0
  - cluster/images/etcd: Build etcd:3.4.13-2 image
    - Uses debian-base:buster-v1.3.0 ([#98401](https://github.com/kubernetes/kubernetes/pull/98401), [@pacoxu](https://github.com/pacoxu)) [SIG Testing]

- Ignore the case when comparing azure tags in service annotation. ([#104705](https://github.com/kubernetes/kubernetes/pull/104705), [@nilo19](https://github.com/nilo19))
- Ignore the case when updating Azure tags. ([#104593](https://github.com/kubernetes/kubernetes/pull/104593), [@nilo19](https://github.com/nilo19))

## Changes by Kind

### Feature

- Kubernetes is now built with go 1.21.9
  - update debian-base/set-cap to bookworm-v1.0.2 ([#124198](https://github.com/kubernetes/kubernetes/pull/124198), [@cpanato](https://github.com/cpanato)) [SIG API Machinery, Architecture, Release and Testing]

### Bug or Regression

message PodDNSConfig {
  // A list of DNS name server IP addresses.
  // This will be appended to the base nameservers generated from DNSPolicy.
  // Duplicated nameservers will be removed.
  // +optional
  repeated string nameservers = 1;

  // A list of DNS search domains for host-name lookup.
  // This will be appended to the base search paths generated from DNSPolicy.
  // Duplicated search paths will be removed.
  // +optional

## Changelog since v1.8.14

### 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. ([#65410](https://github.com/kubernetes/kubernetes/pull/65410), [@nikhita](https://github.com/nikhita))

### Other notable changes

- The Go API for logging configuration in `k8s.io/component-base` was moved to `k8s.io/component-base/logs/api/v1`. The configuration file format and command line flags are the same as before. ([#105797](https://github.com/kubernetes/kubernetes/pull/105797), [@pohly](https://github.com/pohly))

- Fixed an issue where kubelet does not set case-insensitive headers for http probes. (#117182, @dddddai) ([#117331](https://github.com/kubernetes/kubernetes/pull/117331), [@dddddai](https://github.com/dddddai)) [SIG API Machinery, Apps and Node]

  * Avoid spurious ELB listener recreation - ignore case when matching protocol ([#47391](https://github.com/kubernetes/kubernetes/pull/47391), [@justinsb](https://github.com/justinsb))

ECLIPSE PUBLIC LICENSE ("AGREEMENT"). ANY USE, REPRODUCTION OR DISTRIBUTION OF THE PROGRAM CONSTITUTES RECIPIENT'S ACCEPTANCE OF THIS AGREEMENT. 1. DEFINITIONS "Contribution" means: a) in the case of the initial Contributor, the initial code and documentation distributed under this Agreement, and b) in the case of each subsequent Contributor: i) changes to the Program, and ii) additions to the Program; where such changes and/or additions to the Program originate from and are distributed by that particular...

### Other (Cleanup or Flake)

- Build: Update Debian base images
  - debian-base:v2.1.3
  - debian-iptables:v12.1.2
  - debian-hyperkube-base:v1.1.3 ([#93924](https://github.com/kubernetes/kubernetes/pull/93924), [@justaugustus](https://github.com/justaugustus)) [SIG API Machinery, Cluster Lifecycle and Release]