public void addAll(final Collection<? extends Histogram> histograms) {
        Objects.requireNonNull(histograms, "histograms");
        for (Histogram histogram : histograms) {
            add(histogram);
        }
    }
@author emeroad
@author netspider
@author jaehong.kim
web/src/main/java/com/navercorp/pinpoint/web/applicationmap/histogram/Histogram.java