private String getKey(final String namespace, final String name) {
        return namespace + "-" + name;
    }
Get and decrement the number of the ingress that enables the domain name to take effect.

@param domain tls domain
@return the previous number of the ingress that enables the domain name to take effect
shenyu-kubernetes-controller/src/main/java/org/apache/shenyu/k8s/cache/IngressSecretCache.java