code: func ValidateDNS1123Subdomain(value string, fldPath *field.Path) field.ErrorList {
  	allErrs := field.ErrorList{}
  	for _, msg := range validation.IsDNS1123Subdomain(value) {
  		allErrs = append(allErrs, field.Invalid(fldPath, value, msg))
  	}
  	return allErrs
  }
docs: // ValidateDNS1123Subdomain validates that a name is a proper DNS subdomain.