@Override
    public List<String> selectApplicationName() {
        Set<String> ids = new HashSet<>();

        for (Entry<String, Rule> entry : alarmRule.entrySet()) {
            ids.add(entry.getValue().getApplicationName());
        }

        return new ArrayList<>(ids);
    }
@author minwoo.jung
@author Jongjin.Bae
web/src/test/java/com/navercorp/pinpoint/web/dao/memory/MemoryAlarmDao.java