public void addTimeHistogram(Collection<TimeHistogram> histogramList) {
        Objects.requireNonNull(histogramList, "histogramList");

        for (TimeHistogram timeHistogram : histogramList) {
            addTimeHistogram(timeHistogram);
        }
    }
to uniquely identify a host from UI, we can use things like hostname, agentId, endpoint, etc
web/src/main/java/com/navercorp/pinpoint/web/applicationmap/rawdata/AgentHistogram.java