折线图加载不出来

## About the bug

**Steps to reproduce:**
List the minimal actions needed to reproduce the behavior.

1. ...
2. ...
3. ...

**Expected behavior:**

**Actual behavior:**

**Visual Proof:**

## About your environment

**Environment info:**

**Config:**

**Logs:**

**Performance:**
Generate profiles with the following commands for bugs related to performance, locking, out of memory (OOM), etc.

```sh
# Commands should be run when the bug is actively.
# Note: This command will run for at least 30 seconds.
curl -o profiles.tar.gz "http://localhost:8086/debug/pprof/all?cpu=true"
curl -o vars.txt "http://localhost:8086/debug/vars"
iostat -xd 1 30 > iostat.txt
# Attach the `profiles.tar.gz`, `vars.txt`, and `iostat.txt` output files.
```

The report provides no reproduction steps, expected or actual behavior, environment details, logs, file names, or tests. First obtain a minimal reproduction for the chart-loading failure and identify the relevant frontend entry point; done means the issue can be reproduced and the line chart loads correctly without regressions.

Written by the indexing model from the issue text.