private void updateMax(int index, double apdex, String agentId, double[] max, List<String> maxAgentId) {
        if (max[index] < apdex) {
            max[index] = apdex;
            maxAgentId.set(index, agentId);
        }
    }
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