([#123520](https://github.com/kubernetes/kubernetes/pull/123520), [@haircommander](https://github.com/haircommander))
- Informers now supports adding Indexers after the informer starts.
   ([#117046](https://github.com/kubernetes/kubernetes/pull/117046), [@howardjohn](https://github.com/howardjohn))
- Printed more information when `kubectl describe` a `VolumeAttributesClass`.

- Ignore apparmor for non-linux operating systems ([#93220](https://github.com/kubernetes/kubernetes/pull/93220), [@wawa0210](https://github.com/wawa0210)) [SIG Node and Windows]
- Ignore root user check when windows pod starts ([#92355](https://github.com/kubernetes/kubernetes/pull/92355), [@wawa0210](https://github.com/wawa0210)) [SIG Node and Windows]

- The new feature gate "SidecarContainers" is now available. This feature introduces sidecar containers, a new type of init container that starts before other containers but remains running for the full duration of the pod's lifecycle and will not block pod termination. ([#116429](https://github.com/kubernetes/kubernetes/pull/116429), [@gjkim42](https://github.com/gjkim42)) [SIG API Machinery,...

    validationActions: [Deny,Audit]
  --- ([#128971](https://github.com/kubernetes/kubernetes/pull/128971), [@aojea](https://github.com/aojea)) [SIG Apps, Architecture, Auth, CLI, Etcd, Network, Release and Testing]
- Kubenetes starts validating NodeSelectorRequirement's values when creating pods. ([#128212](https://github.com/kubernetes/kubernetes/pull/128212), [@AxeZhan](https://github.com/AxeZhan)) [SIG Apps and Scheduling]

    <tika:uti>public.jpeg</tika:uti>
    <magic priority="50">
      <!-- FFD8 is the SOI (Start Of Image) marker.              -->
      <!-- It is followed by another marker that starts with FF. -->
      <match value="0xffd8ff" type="string" offset="0"/>
    </magic>
    <glob pattern="*.jpg"/>
    <glob pattern="*.jpeg"/>
    <glob pattern="*.jpe"/>
    <glob pattern="*.jif"/>

- Upgrades `IPv6Dualstack` to `Beta` and turns it on by default. New clusters or existing clusters are not be affected until an actor starts adding secondary Pods and service CIDRS CLI flags as described here: [IPv4/IPv6 Dual-stack](https://github.com/kubernetes/enhancements/tree/master/keps/sig-network/563-dual-stack) ([#98969](https://github.com/kubernetes/kubernetes/pull/98969), [@...

## Changelog since v1.31.0-alpha.1

## Urgent Upgrade Notes

### (No, really, you MUST read this before you upgrade)

 - The scheduler starts to use QueueingHint registered for Pod/Updated event to determine whether unschedulable Pods update make them schedulable, when the feature gate `SchedulerQueueingHints` is enabled.

We can insert at least N - 1 limbs without // overflowing m. After that, we need to reduce every time we shift. i := len(x.limbs) - 1 // For the first N - 1 limbs we can skip the actual shifting and position // them at the shifted position, which starts at min(N - 2, i). start := len(m.nat.limbs) - 2 if i < start { start = i } for j := start; j >= 0; j-- { out.limbs[j] = x.limbs[i] i-- } // We shift in the remaining limbs, reducing modulo m each time. for i >= 0 { out.shiftIn(x.limbs[i], m) i-- }...

!default;\n$rfs-font-size-unit: rem !default;\n\n@if $rfs-font-size-unit != rem and $rfs-font-size-unit != px {\n  @error \"`#{$rfs-font-size-unit}` is not a valid unit for $rfs-font-size-unit. Use `px` or `rem`.\";\n}\n\n// Breakpoint at where font-size starts decreasing if screen width is smaller\n$rfs-breakpoint: 1200px !default;\n$rfs-breakpoint-unit: px !default;\n\n@if $rfs-breakpoint-unit != px and $rfs-breakpoint-unit != em and $rfs-breakpoint-unit != rem {\n  @error \"`#{$rfs-breakpoint-unit}` is...

!default;\n$rfs-font-size-unit: rem !default;\n\n@if $rfs-font-size-unit != rem and $rfs-font-size-unit != px {\n  @error \"`#{$rfs-font-size-unit}` is not a valid unit for $rfs-font-size-unit. Use `px` or `rem`.\";\n}\n\n// Breakpoint at where font-size starts decreasing if screen width is smaller\n$rfs-breakpoint: 1200px !default;\n$rfs-breakpoint-unit: px !default;\n\n@if $rfs-breakpoint-unit != px and $rfs-breakpoint-unit != em and $rfs-breakpoint-unit != rem {\n  @error \"`#{$rfs-breakpoint-unit}` is...