public Set<String> removeDomainByIngress(final String namespace, final String ingressName) {
        return INGRESS_DOMAIN_MAP.remove(getKey(namespace, ingressName));
    }
Remove domain set by ingress.

@param namespace namespace
@param ingressName ingressName
@return domain set
shenyu-kubernetes-controller/src/main/java/org/apache/shenyu/k8s/cache/IngressSecretCache.java