</li>

<li>
In all other cases, <code>x.f</code> is illegal.
</li>

<li>
If <code>x</code> is of pointer type and has the value
<code>nil</code> and <code>x.f</code> denotes a struct field,
assigning to or evaluating <code>x.f</code>
causes a <a href="#Run_time_panics">run-time panic</a>.
</li>

<li>
If <code>x</code> is of interface type and has the value
<code>nil</code>, <a href="#Calls">calling</a> or

      iptables, saving a bit of memory/time/cpu. ([#106030](https://github.com/kubernetes/kubernetes/pull/106030), [@danwinship](https://github.com/danwinship)) [SIG Network]
- Topology Aware Hints now ignores unready endpoints when assigning hints. ([#106510](https://github.com/kubernetes/kubernetes/pull/106510), [@robscott](https://github.com/robscott))

- Azure: set dest prefix and port for IPv6 inbound security rule ([#91831](https://github.com/kubernetes/kubernetes/pull/91831), [@aramase](https://github.com/aramase)) [SIG Cloud Provider]
- Fix public IP not shown issues after assigning public IP to Azure VMs ([#90886](https://github.com/kubernetes/kubernetes/pull/90886), [@feiskyer](https://github.com/feiskyer)) [SIG Cloud Provider]

- Fix public IP not shown issues after assigning public IP to Azure VMs ([#90886](https://github.com/kubernetes/kubernetes/pull/90886), [@feiskyer](https://github.com/feiskyer)) [SIG Cloud Provider]

- Fix public IP not shown issues after assigning public IP to Azure VMs ([#90886](https://github.com/kubernetes/kubernetes/pull/90886), [@feiskyer](https://github.com/feiskyer)) [SIG Cloud Provider]

*   `etcd2` as a backend is deprecated and support will be removed in Kubernetes 1.13 or 1.14.

### **Auth**

*   Default controller-manager options for `--cluster-signing-cert-file` and `--cluster-signing-key-file` are deprecated and will be removed in a future release. ([#54495](https://github.com/kubernetes/kubernetes/pull/54495),[ @mikedanese](https://github.com/mikedanese))

- The kube-controller-manager managed signers can now have distinct signing certificates and keys.  See the help about `--cluster-signing-[signer-name]-{cert,key}-file`.  `--cluster-signing-{cert,key}-file` is still the default. ([#90822](https://github.com/kubernetes/kubernetes/pull/90822), [@deads2k](https://github.com/deads2k)) [SIG API Machinery, Apps and Auth]

    * configuration scripts to allow configuration of signing duration of
    * certificates issued via the Certificate Signing Request API.

kube-controller-manager has dropped support for the `--insecure-experimental-approve-all-kubelet-csrs-for-group` flag. It is accepted in 1.7, but ignored. Instead, the csrapproving controller uses authorization checks to determine whether to approve certificate signing requests: ([#45619](https://github.com/kubernetes/kubernetes/pull/45619), [@mikedanese](https://github.com/mikedanese))

    * Before upgrading, users must ensure their controller manager will enable the csrapproving controller, create...

- The kube-controller-manager's deprecated `--experimental-cluster-signing-duration` flag is now removed. Adapt your machinery to use the `--cluster-signing-duration` flag that is available since v1.19. ([#108476](https://github.com/kubernetes/kubernetes/pull/108476), [@ialidzhikov](https://github.com/ialidzhikov))