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

type contextKeyType string

const contextLogKey = contextKeyType("miniolog")

// KeyVal - appended to ReqInfo.Tags
type KeyVal struct {
	Key string
	Val string
}

// ObjectVersion object version key/versionId
type ObjectVersion struct {
	ObjectName string
	VersionID  string `json:"VersionId,omitempty"`
}

// ReqInfo stores the request info.
// Reading/writing directly to struct requires appropriate R/W lock.

		entry.API.Name = reqInfo.API
		entry.API.Bucket = reqInfo.BucketName
		entry.API.Object = reqInfo.ObjectName
		entry.API.Objects = make([]audit.ObjectVersion, 0, len(reqInfo.Objects))
		for _, ov := range reqInfo.Objects {
			entry.API.Objects = append(entry.API.Objects, audit.ObjectVersion{
				ObjectName: ov.ObjectName,
				VersionID:  ov.VersionID,
			})
		}
		entry.API.Status = http.StatusText(statusCode)

	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 {

	deploymentID := req.DeploymentID
	if req.DeploymentID == "" {
		deploymentID = xhttp.GlobalDeploymentID
	}

	objects := make([]log.ObjectVersion, 0, len(req.Objects))
	for _, ov := range req.Objects {
		objects = append(objects, log.ObjectVersion{
			ObjectName: ov.ObjectName,
			VersionID:  ov.VersionID,
		})
	}

	entry := log.Entry{
		DeploymentID: deploymentID,
		Level:        logKind,

	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
}