A Kubernetes Cluster Name. Valid Kubernetes Cluster name must be 63 characters or less and must be empty or begin and end with an alphanumeric character ([a-z0-9A-Z]) with dashes (-), underscores (_), dots (.), and alphanumerics between.
The kubernetes version in which a cluster is running. This imposes restrictions on what kubernetes versions can be run in a cluster's nodepools. Additionally, not all kubernetes versions are viable upgrade targets for all prior versions.