A PriorityClass assigns a numeric priority to pods so the scheduler can decide ordering and preemption. The PriorityClass YAML Generator writes that manifest from a form so you do not have to recall the scheduling.k8s.io/v1 schema.
You set the PriorityClass name and a numeric value (higher is more important). You can mark it as the global default, which applies to pods that do not set their own priority, and add a human-readable description. The resulting YAML is valid scheduling.k8s.io/v1.
The name is validated as an RFC 1123 label and the value is required and must be an integer. Problems are reported in a clear panel. Everything runs locally and nothing is uploaded.