Linux.com - https://www.linux.com/news/full-time-job-keeping-kubernetes
There is no such thing as Kubernetes LTS (and that’s fantastic).
TL;DR – Unabated 1.xx major “minor” releases of “vanilla” upstream Kubernetes every three months could continue forever. You have to keep up, while also paying close attention to Kubernetes API object versioning. This relentless pace is the key ingredient in Kubernetes’ domination of the distributed infrastructure world.