metrics: raft waterfall's panel is broken

## Bug Report

<img width="1441" alt="Image" src="https://github.com/user-attachments/assets/be9644d5-4126-4dba-a1c4-21f0af70ee68" />

The "count" metrics should align to the right Y-axis.

The following is the original correct one:

<img width="1430" alt="Image" src="https://github.com/user-attachments/assets/cbc13013-6652-4567-b49e-7346fa8fbaa6" />

