private void consume(ObjLongConsumer<StatusCodeMetric> consumer) {
        statistics.forEach((metric, adder) -> {
            long value = adder.sumThenReset();
            if (value > 0) consumer.accept(metric, value);
        });
    }
A {@link RequestLog} implementation that collects statistics like HTTP response types aggregated by category.
Implemented as a {@link RequestLog} instead of {@link org.eclipse.jetty.server.handler.EventsHandler} to ensure
that 400 responses from e.g. invalid request headers are also included.

@author ollivir
@author bjorncs
container-core/src/main/java/com/yahoo/jdisc/http/server/jetty/MetricAggregatingRequestLog.java