public List<Pair<String, String>> getIngressName(final String namespace, final String serviceName) {
        return INGRESS_MAP.get(getKey(namespace, serviceName));
    }
Get ingress namespace and name by service namespace and namespace.

@param namespace namespace
@param serviceName service name
@return ingress namespace and name
shenyu-kubernetes-controller/src/main/java/org/apache/shenyu/k8s/cache/ServiceIngressCache.java