func TestGetObjectRetentionMeta(t *testing.T) {
	tests := []struct {
		metadata map[string]string
		expected ObjectRetention
	}{
		{
			metadata: map[string]string{
				"Authorization":        "AWS4-HMAC-SHA256 <cred_string>",
				"X-Amz-Content-Sha256": "",
				"Content-Encoding":     "",
			},
			expected: ObjectRetention{},
		},
		{
			metadata: map[string]string{
				"x-amz-object-lock-mode": "governance",
			},

### Internal metadata for replication

`xl.meta` that is in use for [versioning](https://github.com/minio/minio/blob/master/docs/bucket/versioning/DESIGN.md) has additional metadata for replication of objects,delete markers and versioned deletes.

// get ObjectOptions for PUT calls from encryption headers and metadata
func putOptsFromReq(ctx context.Context, r *http.Request, bucket, object string, metadata map[string]string) (opts ObjectOptions, err error) {
	return putOpts(ctx, bucket, object, r.Form.Get(xhttp.VersionID), r.Header, metadata)
}

func putOpts(ctx context.Context, bucket, object, vid string, hdrs http.Header, metadata map[string]string) (opts ObjectOptions, err error) {

message ResourceClaimTemplateList {
  // Standard list metadata
  // +optional
  optional k8s.io.apimachinery.pkg.apis.meta.v1.ListMeta metadata = 1;

  // Items is the list of resource claim templates.
  repeated ResourceClaimTemplate items = 2;
}

// ResourceClaimTemplateSpec contains the metadata and fields for a ResourceClaim.
message ResourceClaimTemplateSpec {

  optional k8s.io.apimachinery.pkg.apis.meta.v1.ObjectMeta metadata = 1;

  // spec represents the specification of the CSI Driver.
  optional CSIDriverSpec spec = 2;
}

// CSIDriverList is a collection of CSIDriver objects.
message CSIDriverList {
  // Standard list metadata

	UserMetadata map[string]string `json:"userMetadata,omitempty"`
	VersionID    string            `json:"versionId,omitempty"`
	Sequencer    string            `json:"sequencer"`
}

// Metadata represents event metadata.
type Metadata struct {
	SchemaVersion   string `json:"s3SchemaVersion"`
	ConfigurationID string `json:"configurationId"`
	Bucket          Bucket `json:"bucket"`
	Object          Object `json:"object"`
}

// integer value. The value can be any valid integer.
message PriorityClass {
  // Standard object's metadata.
  // More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#metadata
  // +optional
  optional k8s.io.apimachinery.pkg.apis.meta.v1.ObjectMeta metadata = 1;

  // value represents the integer value of this priority class. This is the actual priority that pods

  optional k8s.io.apimachinery.pkg.apis.meta.v1.ObjectMeta metadata = 1;

  // spec represents the specification of the CSI Driver.
  optional CSIDriverSpec spec = 2;
}

// CSIDriverList is a collection of CSIDriver objects.
message CSIDriverList {
  // Standard list metadata

message RoleBindingList {
  // Standard object's metadata.
  // +optional
  optional k8s.io.apimachinery.pkg.apis.meta.v1.ListMeta metadata = 1;

  // Items is a list of RoleBindings
  repeated RoleBinding items = 2;
}

// RoleList is a collection of Roles
message RoleList {
  // Standard object's metadata.
  // +optional
  optional k8s.io.apimachinery.pkg.apis.meta.v1.ListMeta metadata = 1;

  // Items is a list of Roles

					return
				}
			}
		case "Metadata":
			var zb0003 uint32
			zb0003, err = dc.ReadArrayHeader()
			if err != nil {
				err = msgp.WrapError(err, "Metadata")
				return
			}
			if cap(z.Metadata) >= int(zb0003) {
				z.Metadata = (z.Metadata)[:zb0003]
			} else {
				z.Metadata = make([]BatchJobKV, zb0003)
			}
			for za0002 := range z.Metadata {
				err = z.Metadata[za0002].DecodeMsg(dc)