- Fixes a regression introduced in 1.29 where conntrack entries for UDP connections
  to deleted pods did not get cleaned up correctly, which could (among other things)

- During initialization phase (preflight), kubeadm now verifies the presence of the conntrack executable ([#85857](https://github.com/kubernetes/kubernetes/pull/85857), [@hnanni](https://github.com/hnanni)) [SIG Cluster Lifecycle]

* Tune down initialDelaySeconds for readinessProbe. ([#33146](https://github.com/kubernetes/kubernetes/pull/33146), [@MrHohn](https://github.com/MrHohn))
* kube-proxy: Add a lower-bound for conntrack (128k default) ([#33051](https://github.com/kubernetes/kubernetes/pull/33051), [@thockin](https://github.com/thockin))

*   Added iptables rules to allow Pod traffic even when default iptables policy is to reject. ([#52569](https://github.com/kubernetes/kubernetes/pull/52569),[ @tmjd](https://github.com/tmjd))
*   You can once again use 0 values for conntrack min, max, max per core, tcp close wait timeout, and tcp established timeout; this functionality was broken in 1.8. ([#55261](https://github.com/kubernetes/kubernetes/pull/55261),[ @ncdc](https://github.com/ncdc))

#### **CoreDNS**

- Adds additional testing to ensure that udp pods conntrack are cleaned up ([#90180](https://github.com/kubernetes/kubernetes/pull/90180), [@JacobTanenbaum](https://github.com/JacobTanenbaum)) [SIG Architecture, Network and Testing]

- github.com/mattn/go-runewidth: v0.0.2
- github.com/mattn/goveralls: v0.0.2
- github.com/mitchellh/go-ps: 4fdf99a
- github.com/mozilla/tls-observatory: 8791a20
- github.com/mwitkow/go-conntrack: cc309e4
- github.com/nbutton23/zxcvbn-go: eafdab6
- github.com/olekukonko/tablewriter: a0225b3
- github.com/quasilyte/go-consistent: c6f3937
- github.com/rogpeppe/fastuuid: 6724a57

## Changes by Kind

### Feature

- Kubelet TCP and HTTP probes are more effective using networking resources: conntrack entries, sockets, ... 

### Feature

- Kubelet TCP and HTTP probes are more effective using networking resources: conntrack entries, sockets, ... 

    contract { callsInPlace(action, InvocationKind.EXACTLY_ONCE) }
    return lock.withLock(action)
  }

  inline fun <T> RealCall.withLock(action: () -> T): T {
    contract { callsInPlace(action, InvocationKind.EXACTLY_ONCE) }
    return lock.withLock(action)
  }

  inline fun <T> Http2Connection.withLock(action: () -> T): T {
    contract { callsInPlace(action, InvocationKind.EXACTLY_ONCE) }

CoreDNS is now the default cluster DNS passing all of the scale/resource usage tests
Node-local DNS cache feature is available in Alpha. This feature deploys a lightweight DNS caching Daemonset that avoids the conntrack and converts queries from UDP to more reliable TCP.
PodReady++ feature now has `kubectl` CLI support.

Progress was made towards finalizing the IPv6 dual stack support KEP and support for topological routing of services.