// - total objects in a bucket
	// - object size histogram per bucket
	BucketsUsage map[string]BucketUsageInfo `json:"bucketsUsageInfo"`
	// Deprecated kept here for backward compatibility reasons.
	BucketSizes map[string]uint64 `json:"bucketsSizes"`

	// TierStats contains per-tier stats of all configured remote tiers
	TierStats *allTierStats `json:"tierStats,omitempty"`
}

func (dui DataUsageInfo) tierStats() []madmin.TierInfo {

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		dataUsageInfo.BucketsUsage = make(map[string]BucketUsageInfo, len(dataUsageInfo.BucketSizes))
		for bucket, size := range dataUsageInfo.BucketSizes {
			dataUsageInfo.BucketsUsage[bucket] = BucketUsageInfo{Size: size}
		}
	}

	// For backward compatibility reasons, we need to add this code.
	if len(dataUsageInfo.BucketSizes) == 0 {
		dataUsageInfo.BucketSizes = make(map[string]uint64, len(dataUsageInfo.BucketsUsage))

      throws BucketOverflowException {
    int bucketSize = 0;
    for (; valueBucketHead != null; valueBucketHead = valueBucketHead.getNextInValueBucket()) {
      checkNoConflict(!value.equals(valueBucketHead.getValue()), "value", entry, valueBucketHead);
      if (++bucketSize > MAX_HASH_BUCKET_LENGTH) {
        throw new BucketOverflowException();
      }
    }
  }

      Object key,
      Object newValue,
      @CheckForNull ImmutableMapEntry<K, V> keyBucketHead,
      boolean throwIfDuplicateKeys)
      throws BucketOverflowException {
    int bucketSize = 0;
    for (; keyBucketHead != null; keyBucketHead = keyBucketHead.getNextInKeyBucket()) {
      if (keyBucketHead.getKey().equals(key)) {
        if (throwIfDuplicateKeys) {