Add documentation for max supported k8s version

[logicminds]

What problem are you trying to solve?

While the min supported k8s version is documented, the max supported version is not. This can lead to a failed linkerd deployment when k8s is upgraded before linkerd.

How should the problem be solved?

A simple chart be kept up to date with the known working versions for the given release.

Any alternatives you've considered?

asking chatgpt.

How would users interact with this feature?

It would serve as documentation only and be found on the main doc site.

Would you like to work on this feature?

yes

[logicminds]

Stable Linkerd Supported Kubernetes Version Matrix

Linkerd Release	1.21	1.22	1.23	1.24	1.25	1.26	1.27	1.28 (Latest)	1.29 (unreleased)
2.10.x	✅	✅	✅	✅	🔴	🔴	🔴	🔴	🔴
2.11.x	✅	✅	✅	✅	🔴	🔴	🔴	🔴	🔴
2.12.x	✅	✅	✅	✅	🔴	🔴	🔴	🔴	🔴
2.13.x	✅	✅	✅	✅	✅	✅	✅	✅	?
2.14.x	✅	✅	✅	✅	✅	✅	✅	✅	?

Please note this is unofficial data gathered by my experience. Also, 2.10-2.11.x officially supported older versions of kubernetes but I didn't notate above since who runs those ancient version of kubernetes.

[wmorgan]

@kflynn can we get this into linkerd/website somewhere?