@Override
        public void entity2Storage(final MinLabeledFunction storageData, final Convert2Storage converter) {
            converter.accept(VALUE, storageData.getValue());
            converter.accept(TIME_BUCKET, storageData.getTimeBucket());
            converter.accept(InstanceTraffic.SERVICE_ID, storageData.getServiceId());
            converter.accept(ENTITY_ID, storageData.getEntityId());
        }
Service ID is required for sort query.
oap-server/server-core/src/main/java/org/apache/skywalking/oap/server/core/analysis/meter/function/min/MinLabeledFunction.java