Fyi @DanTup in case you are directly launching links to the timeline page from vscode.

I am, thanks! I'll need to handle this based on the version. The current live version is 0.9.5+1. Is it safe for me to assume that >= 0.9.6 would include this, and anything < 0.9.5+1 should use the old URLs?

yes that is correct. See also #2563, which renames timeline to performance. so >= 0.9.6

"timeline" --> "performance"
"performance" --> "cpu-profiler"

Got it! I've got a fix ready to ship in a patch, though I'm a little worried about caching causing issues - I added some notes here:

#1674 (comment)

If users see the same thing I did, they might end up getting errors because the old JS still loads and we use the new page IDs.

I've published a new Dart-Code with the new page IDs (selected based on the version). I'll send a PR that removes the service worker here shortly.

If you let me know when DevTools is released, I'll re-test using the published version. Thanks!