性能采集里面的数据代表啥？cpu里面的value，sys_value，memory里面的value

cpu {'timestamp': 1672899794758, 'pid': 293, 'value': 2.3562656988211743, 'sys_value': 111.0091743119266, 'count': 2}
memory {'pid': 293, 'timestamp': 1672899794759, 'value': 66.51136779785156}
cpu {'timestamp': 1672899795632, 'pid': 293, 'value': 2.324113729589495, 'sys_value': 117.65765765765767, 'count': 2}
memory {'pid': 293, 'timestamp': 1672899795633, 'value': 66.51136779785156}
cpu {'timestamp': 1672899796639, 'pid': 293, 'value': 2.3856375820918045, 'sys_value': 107.02665282104536, 'count': 2}
memory {'pid': 293, 'timestamp': 1672899796640, 'value': 66.51136779785156}
cpu {'timestamp': 1672899797635, 'pid': 293, 'value': 2.3897498800444428, 'sys_value': 108.18181818181819, 'count': 2}
memory {'pid': 293, 'timestamp': 1672899797640, 'value': 66.51136779785156}
cpu {'timestamp': 1672899798637, 'pid': 293, 'value': 2.387366449075093, 'sys_value': 110.05405405405405, 'count': 2}
memory {'pid': 293, 'timestamp': 1672899798642, 'value': 66.51136779785156}

The issue provides sample CPU and memory records from tidevice but names no source file, test, or entry point. Start by locating the performance collection code that emits the `cpu` and `memory` records, then document the meanings and units of `value`, `sys_value`, `count`, and memory `value`; done when each field is explained in project documentation.

Written by the indexing model from the issue text.