if seen.Has(schedulingGate.Name) {
			allErrs = append(allErrs, field.Duplicate(fldPath.Index(i), schedulingGate.Name))
		}
		seen.Insert(schedulingGate.Name)
	}
	return allErrs
}

func validatePodDNSConfig(dnsConfig *core.PodDNSConfig, dnsPolicy *core.DNSPolicy, fldPath *field.Path, opts PodValidationOptions) field.ErrorList {
	allErrs := field.ErrorList{}