#2021-05-13-20:30:00+0800 scale in cloudchat tikv

- Cause: Scale CloudChat TiKV [machine type](https://pingcap.zendesk.com/agent/tickets/196)
- Operation: execute the following commands

```
kubectl edit tc -n tidb1311285575352848384 
   annotations:
     tikv.tidb.pingcap.com/delete-slots: '[23,22,21,20...0]'
   tikv:
     replicas: 24
```

- Impact: TiKV will has 24 pods
- Recovery operation: No

- Time window: 02:00 PM, 2021 May 21 ~ 02:30 PM, 2021 May 21