private void deleteGlobalDefaultBackend(final String namespace, final String name) {
        if (Objects.nonNull(globalDefaultBackend) && (namespace + "/" + name).equals(globalDefaultBackend.getLeft().getLeft())) {
            globalDefaultBackend = null;
        }
    }
Reconcile cycle.

@param request request
@return reconcile result
shenyu-kubernetes-controller/src/main/java/org/apache/shenyu/k8s/reconciler/IngressReconciler.java