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