Unable to select few comparison metrics, for example, `context-switches` with error: ``` Failed to deserialize request: Error("unknown variant `context-switches`, expected one of `instructions:u`, `cycles:u`, `faults`, `max-rss`, `task-clock`, `wall-time`, `cpu-clock`", line: 1, column: 126) ``` * Open some compare link, for example https://perf.rust-lang.org/compare.html?start=f80e454450c891c075617d23532c6eb317f4471d&end=6ac8adad1f7d733b5b97d1df4e7f96e73a46db42&stat=instructions:u * Click `Do another comparison` and select other comparison metric, `context-switches`, for example. * Click submit, error will appear, but expected instead to show page with that metric. This worked recently, so broken in last few commits, i guess.