code: func ValidateRuntimeClass(rc *node.RuntimeClass) field.ErrorList {
  	allErrs := apivalidation.ValidateObjectMeta(&rc.ObjectMeta, false, apivalidation.NameIsDNSSubdomain, field.NewPath("metadata"))
  
  	for _, msg := range apivalidation.NameIsDNSLabel(rc.Handler, false) {
  		allErrs = append(allErrs, field.Invalid(field.NewPath("handler"), rc.Handler, msg))
  	}
  
  	return allErrs
  }
docs: // ValidateRuntimeClass validates the RuntimeClass