ReferenceGrant.spec.from[].kind

Kind is the kind of the referent. Although implementations may support additional resources, the following types are part of the "Core" support level for this field. When used to permit a SecretObjectReference: * Gateway When used to permit a BackendObjectReference: * GRPCRoute * HTTPRoute * TCPRoute * TLSRoute * UDPRoute

• minLength: 1
• maxLength: 63
• pattern: ^[a-zA-Z]([-a-zA-Z0-9]*[a-zA-Z0-9])?$