@Override
    public final void in(Metrics metrics) {
        if (!dataCarrier.produce(metrics)) {
            abandonCounter.inc();
        }
    }
MetricsAggregateWorker#in operation does include enqueue only
oap-server/server-core/src/main/java/org/apache/skywalking/oap/server/core/analysis/worker/MetricsAggregateWorker.java