return
	}

	for bucket, usageInfo := range dataUsageInfo.BucketsUsage {
		stat := globalReplicationStats.Load().getLatestReplicationStats(bucket)
		// Total space used by bucket
		ch <- prometheus.MustNewConstMetric(
			prometheus.NewDesc(
				prometheus.BuildFQName(bucketNamespace, "usage", "size"),
				"Total bucket size",
				[]string{"bucket"}, nil),
			prometheus.GaugeValue,

    return null;
  }

  @Nullable ImmutableMapEntry<K, V> getNextInValueBucket() {
    return null;
  }

  /**
   * Returns true if this entry has no bucket links and can safely be reused as a terminal entry in
   * a bucket in another map.
   */
  boolean isReusable() {
    return true;
  }

  static class NonTerminalImmutableMapEntry<K, V> extends ImmutableMapEntry<K, V> {
    /*

	// Check that the service account can access the public bucket.
	buckets, err := svcClient.ListBuckets(ctx)
	if err != nil {
		c.Fatalf("err fetching buckets %s", err)
	}
	if len(buckets) != 1 || buckets[0].Name != "public" {
		c.Fatalf("service account should only have access to public bucket")
	}

	// Create an madmin client with the service account creds.

### Using `mc encrypt` (recommended)

MinIO automatically encrypts all objects on buckets if KMS is successfully configured and bucket encryption configuration is enabled for each bucket as shown below:

```
mc encrypt set sse-s3 myminio/bucket/
```

Verify if MinIO has `sse-s3` enabled

```
mc encrypt info myminio/bucket/
Auto encryption 'sse-s3' is enabled
```

### Using environment (not-recommended)

server allows WORM for specific objects or by configuring a bucket with default object lock configuration that applies default retention mode and retention duration to all objects. This makes objects in the bucket immutable i.e. delete of the version are not allowed until an expiry specified in the bucket's object lock configuration or object retention.

Object locking requires locking to be enabled on a bucket at the time of bucket creation refer to `mc mb --with-lock`, object locking enables...

	testCases := []struct {
		bucket string
		result bool
	}{
		// MinIO meta bucket.
		{
			bucket: minioMetaBucket,
			result: true,
		},
		// MinIO meta bucket.
		{
			bucket: minioMetaMultipartBucket,
			result: true,
		},
		// MinIO meta bucket.
		{
			bucket: minioMetaTmpBucket,
			result: true,
		},
		// Normal bucket
		{
			bucket: "mybucket",

		return nil
	}
	return dst
}

// bucketsUsageInfo returns the buckets usage info as a map, with
// key as bucket name
func (d *dataUsageCache) bucketsUsageInfo(buckets []BucketInfo) map[string]BucketUsageInfo {
	dst := make(map[string]BucketUsageInfo, len(buckets))
	for _, bucket := range buckets {
		e := d.find(bucket.Name)
		if e == nil {
			continue
		}
		flat := d.flatten(*e)

## 2. Enable bucket lifecycle configuration

- Create a bucket lifecycle configuration which expires the objects under the prefix `old/` on `2020-01-01T00:00:00.000Z` date and the objects under `temp/` after 7 days.
- Enable bucket lifecycle configuration using `mc`:

```sh
$ mc ilm import play/testbucket <<EOF
{
    "Rules": [
        {

		dirQuorum: 1,
		objQuorum: 1,
		bucket:    bucket,
		strict:    false, // Allow less strict matching.
	}

	path := baseDirFromPrefix(prefix)
	filterPrefix := strings.Trim(strings.TrimPrefix(prefix, path), slashSeparator)
	if path == prefix {
		filterPrefix = ""
	}

	lopts := listPathRawOptions{
		disks:          disks,
		bucket:         bucket,
		path:           path,
		filterPrefix:   filterPrefix,

					if configRetriableErrors(err) {
						logger.Info("Waiting for list buckets to succeed to initialize buckets.. possible cause (%v)", err)
						time.Sleep(time.Duration(r.Float64() * float64(time.Second)))
						continue
					}
					bootLogIf(GlobalContext, fmt.Errorf("Unable to list buckets to initialize bucket metadata sub-system: %w", err))
				}

				buckets = make([]string, len(bucketsList))
				for i := range bucketsList {