Merge pull request #4906 from a-mccarthy/fix-4846

Update compatibility matrix for 1.9

README.md

@@ -38,13 +38,20 @@ See [the list of releases][6] to find out about feature changes.
 
 The following is a list of the supported Kubernetes versions for each Velero version.
 
-| Velero version | Kubernetes versions|
-|----------------|--------------------|
-| 1.8            | 1.16-latest        |
-| 1.6.3-1.7.1    | 1.12-latest        |
-| 1.60-1.6.2     | 1.12-1.21          |
-| 1.5            | 1.12-1.21          |
-| 1.4            | 1.10-1.21          |
+| Velero version | Expected Kubernetes version compatibility| Tested on Kubernetes version|
+|----------------|--------------------|--------------------|
+| 1.9            | 1.16-latest        |  1.20.5, 1.21.2, 1.22.5, 1.23, and 1.24 |
+| 1.8            | 1.16-latest        |  |
+| 1.6.3-1.7.1    | 1.12-latest        ||
+| 1.60-1.6.2     | 1.12-1.21          ||
+| 1.5            | 1.12-1.21          ||
+| 1.4            | 1.10-1.21          | |
+
+Velero supports IPv4, IPv6, and dual stack environments. Support for this was tested against Velero v1.8.
+
+The Velero maintainers are continuously working to expand testing coverage, but are not able to test every combination of Velero and supported Kubernetes versions for each Velero release. The table above is meant to track the current testing coverage and the expected supported Kubernetes versions for each Velero version. If you have a question about test coverage before v1.9, please reach out in the [#velero-users](https://kubernetes.slack.com/archives/C6VCGP4MT) Slack channel.
+
+If you are interested in using a different version of Kubernetes with a given Velero version, we'd recommend that you perform testing before installing or upgrading your environment. For full information around capabilities within a release, also see the Velero [release notes](https://github.com/vmware-tanzu/velero/releases) or Kubernetes [release notes](https://github.com/kubernetes/kubernetes/tree/master/CHANGELOG). See the Velero [support page](https://velero.io/docs/latest/support-process/) for information about supported versions of Velero.
 
 [1]: https://github.com/vmware-tanzu/velero/workflows/Main%20CI/badge.svg
 [2]: https://github.com/vmware-tanzu/velero/actions?query=workflow%3A"Main+CI"