Optional[customOptional[unknownOptionalendpointsNumber of instances in etcd cluster.
3 by default.
Control plane with etcd_cluster_size: 3 called "Highly Available" ("HA"), because it's Kubernetes API
will be available despite a failure of one control plane instance.
Nebius VPC Subnet ID where control plane instances will be located. Also will be default NodeGroup subnet.
Desired Kubernetes version of the cluster. For now only acceptable format is
<major>.<minor> like "1.31". Option for patch version update will be added later.
Specification of endpoints of cluster control plane.