}
	if err := csrSigningFilesValid(o.LegacyUnknownSignerConfiguration); err != nil {
		errs = append(errs, fmt.Errorf("%q: %v", "cluster-signing-legacy-unknown", err))
	}

	singleSigningFile := len(o.ClusterSigningCertFile) > 0 || len(o.ClusterSigningKeyFile) > 0
	anySpecificFilesSet := len(o.KubeletServingSignerConfiguration.CertFile) > 0 || len(o.KubeletServingSignerConfiguration.KeyFile) > 0 ||