private void onWork(List<Metrics> metricsList) {
        metricsList.forEach(metrics -> {
            aggregationCounter.inc();
            mergeDataCache.accept(metrics);
        });

        flush();
    }
Dequeue consuming. According to {@link IConsumer#consume(List)}, this is a serial operation for every work
instance.

@param metricsList from the queue.
oap-server/server-core/src/main/java/org/apache/skywalking/oap/server/core/analysis/worker/MetricsAggregateWorker.java