The cache metrics computation (differential) is wrong
The cache metrics are refreshed every 3 hours, and we can see that it fixes incorrect values, that are updated meanwhile using the differential computation (+1 / -1):

![image](https://github.com/huggingface/dataset-viewer/assets/1676121/fc80d831-8251-4ce8-b7a2-1cb1e9445b9f)


The cache metrics computation (differential) is wrong: The cache metrics are refreshed every 3 hours, and we can see that it fixes incorrect values, that are updated meanwhile using the differential computation (+1 / -1):

![image](https://github.com/huggingface/dataset-viewer/assets/1676121/fc80d831-8251-4ce8-b7a2-1cb1e9445b9f)

