private AgentHistogram selectAgentHistogram(String agentName) {
        for (AgentHistogram agentHistogram : agentHistogramList.getAgentHistogramList()) {
            Application agentId = agentHistogram.getAgentId();
            if (agentId.getName().equals(agentName)) {
                return agentHistogram;
            }
        }
        return null;
    }
most of the features have been delegated to AgentHistogramList upon refactoring
TODO: functionality reduced to creating views - need to be renamed or removed

@author emeroad
web/src/main/java/com/navercorp/pinpoint/web/applicationmap/histogram/AgentTimeHistogram.java