for vbd in xapi.VM.get_VBDs(vm_uuid):
                vbd_rec = _get_record(xapi, 'VBD', vbd)
                ret[vbd_rec['device']] = _get_metrics_record(xapi, 'VBD',
                                                             vbd_rec)
                del ret[vbd_rec['device']]['last_updated']