BackendTLSPolicy.spec.validation.caCertificateRefs[].group

Group is the group of the referent. For example, "gateway.networking.k8s.io". When unspecified or empty string, core API group is inferred.

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