public static String buildId(String serviceId, String instanceName) {
            if (StringUtil.isBlank(instanceName)) {
                instanceName = Const.BLANK_ENTITY_NAME;
            }
            return serviceId
                + Const.ID_CONNECTOR
                + encode(instanceName);
        }
@param serviceId built by {@link ServiceID#buildId(String, boolean)}
@return service instance id
oap-server/server-core/src/main/java/org/apache/skywalking/oap/server/core/analysis/IDManager.java