public long getConnectionUsedRate() {
        if (activeConnectionAvg == 0 || maxConnectionAvg == 0) {
            return 0;
        } else {
            return (activeConnectionAvg * 100L) / maxConnectionAvg;
        }
    }
@author Taejin Koo
@author Jongjin.Bae
batch/src/main/java/com/navercorp/pinpoint/batch/alarm/vo/DataSourceAlarmVO.java