You can now enable Long Term Support starting with Kubernetes 1.27. Once enabled, this will provide you a 2 year support window for a specific version of Kubernetes. We will provide the ability to have one Kubernetes version enabled for LTS at any one time. For example, the next LTS capable version would be 1.27 plus 2 years (1.33).
To learn more, visit: https://aka.ms/aks/upgrades-and-lts