validator: remove duplicate hostname from ingress (#2884)

Signed-off-by: Mustafa Abdelrahman <mustafa.abdelrahman@zalando.de>

dataclients/kubernetes/definitions/ingressvalidator.go

@@ -14,7 +14,6 @@ func (igv *IngressV1Validator) Validate(item *IngressV1Item) error {
 	errs = append(errs, igv.validateFilterAnnotation(item.Metadata.Annotations))
 	errs = append(errs, igv.validatePredicateAnnotation(item.Metadata.Annotations))
 	errs = append(errs, igv.validateRoutesAnnotation(item.Metadata.Annotations))
-	errs = append(errs, igv.validateHosts(item))
 
 	return errorsJoin(errs...)
 }
@@ -51,15 +50,3 @@ func (igv *IngressV1Validator) validateRoutesAnnotation(annotations map[string]s
 	}
 	return nil
 }
-
-func (igv *IngressV1Validator) validateHosts(item *IngressV1Item) error {
-	var errs []error
-	uniqueHosts := make(map[string]struct{}, len(item.Spec.Rules))
-	for _, rule := range item.Spec.Rules {
-		if _, ok := uniqueHosts[rule.Host]; ok {
-			errs = append(errs, fmt.Errorf("duplicate host %q", rule.Host))
-		}
-		uniqueHosts[rule.Host] = struct{}{}
-	}
-	return errorsJoin(errs...)
-}