void decreaseDiskStoreStats() {
      synchronized (statsMap) {
        queueSize -= statsMap.getOrDefault(StatsKey.DISK_QUEUE_SIZE, 0).intValue();
        backupsInProgress -= statsMap.getOrDefault(StatsKey.BACKUPS_IN_PROGRESS, 0).intValue();
        removed = true;
      }
    }
Only decrease those values which can both increase and decrease and not values which can only
increase like read/writes

Remove last sample value from the aggregate. Last Sampled value can be obtained from the
DefaultHashMap for the disk
geode-core/src/main/java/org/apache/geode/management/internal/beans/stats/MemberLevelDiskMonitor.java