- Systems running `iptables` 1.8.0 or newer should start it in legacy mode. Please note that this affects all versions of Kubernetes and not only v1.16.0. For more detailed information about the issue and how to apply a workaround, please refer to the official documentation
- Generating informers for packages in directories containing dots in their name is broken. This will be fixed in v1.16.1. ([#82860](https://github.com/kubernetes/kubernetes/issues/82860))

          DROP, which causes outbound container traffic to stop working by
          default. See
          [#40182](https://github.com/kubernetes/kubernetes/issues/40182) for
          the workaround.

        - The support for the v1 registries was removed.

- Docker 1.12.6

    - Overlay2 and live-restore are not validated.

    - **Known issues**

  This issue only could happen if you use custom plugins or if you change plugin set being used in your scheduler via the scheduler config. ([#122013](https://github.com/kubernetes/kubernetes/pull/122013), [@sanposhiho](h...

- `kubeadm`: generate CA certificates with a start time that is offset 5
  minutes in the past relative to the current system time to workaround cases of
  clock desync. ([#118922](https://github.com/kubernetes/kubernetes/pull/118922), [@champtar](https://github.com/champtar))
- `plugin_evaluation_total` metric supports prescore/score extension point.

- Kubernetes cannot distinguish between GCE Zonal PDs and Regional PDs with the same name. To workaround this issue, precreate PDs with unique names. PDs that are dynamically provisioned do not encounter this issue. ([#70716](https://github.com/kubernetes/kubernetes/pull/70716), [@msau42](https://github.com/msau42))

## Known Issues

- the IP allocator in v1.17.0 can return errors such as `the cluster IP <ip> for service <service-name>...

    The plugins are being updated to resolve this issue ([#43488](https://github.com/kubernetes/kubernetes/issues/43488)).
    You can disable CRI explicitly (`--enable-cri=false`) as a
    temporary workaround.
      * The standard `bridge` plugin have been validated to interoperate with
         the new CRI + CNI code path.
      * If you are using plugins other than `bridge`, make sure you have

### Feature

- Kubeadm: generate CA certificates with a start time that is offset 5 minutes in the past relative to the current system time to workaround cases of clock desync.

- Fix a bug with dual stack clusters using the beta feature MultiCIDRServiceAllocator can not create dual stack Services or Services with IPs on the secondary range. User that want to use this feature in 1.30 with dual stack clusters can workaround the issue by setting the feature gate DisableAllocatorDualWrite to true ([#127598](https://github.com/kubernetes/kubernetes/pull/127598), [@aojea](https://github.com/aojea)) [SIG Network and Testing]

## Changes by Kind

### Feature

- Kubeadm: generate CA certificates with a start time that is offset 5 minutes in the past relative to the current system time to workaround cases of clock desync.