for _, certError := range ValidateCertValidity(c) {
		klog.Warningf("WARNING: %s", certError.Error())
	}
	return allErrs
}

// ValidateAPIServer validates a APIServer object and collects all encountered errors
func ValidateAPIServer(a *kubeadm.APIServer, fldPath *field.Path) field.ErrorList {
	allErrs := field.ErrorList{}
	allErrs = append(allErrs, ValidateCertSANs(a.CertSANs, fldPath.Child("certSANs"))...)