ReferenceGrant.spec.from[].group

Group is the group of the referent. When empty, the Kubernetes core API group is inferred. Support: Core

• maxLength: 253
• pattern: ^$|^[a-z0-9]([-a-z0-9]*[a-z0-9])?(\.[a-z0-9]([-a-z0-9]*[a-z0-9])?)*$