ch <- prometheus.MustNewConstMetric(
				prometheus.NewDesc(
					prometheus.BuildFQName(bucketNamespace, "objects", "histogram"),
					"Total number of versions of objects in a bucket",
					[]string{"bucket", "object_versions"}, nil),
				prometheus.GaugeValue,
				float64(v),
				bucket,
				k,
			)
		}
	}
}

// collects storage metrics for MinIO server in Prometheus specific format

	CreationDate string // time string of format "2006-01-02T15:04:05.000Z"
}

// ObjectVersion container for object version metadata
type ObjectVersion struct {
	Object
	IsLatest  bool
	VersionID string `xml:"VersionId"`

	isDeleteMarker bool
}

// MarshalXML - marshal ObjectVersion
func (o ObjectVersion) MarshalXML(e *xxml.Encoder, start xxml.StartElement) error {
	if o.isDeleteMarker {

	req := logger.GetReqInfo(ctx)
	if req != nil {
		req.Lock()
		defer req.Unlock()
		req.Objects = make([]logger.ObjectVersion, 0, len(objects))
		for _, ov := range objects {
			req.Objects = append(req.Objects, logger.ObjectVersion{
				ObjectName: ov.ObjectName,
				VersionID:  ov.VersionID,
			})
		}
		return logger.SetReqInfo(ctx, req)
	}
	return ctx
}