Flutter Frame Tracking Integration

[ueman]

Flutter allows the developer to read how long it took for a frame to draw. See FrameTiming.

It would be nice if Sentry attaches a listener and sends events or add breadcrumbs if a frame took to long to draw.

Since there's no performance tracing yet, I can imagine that it's not that useful since you don't really know what caused dropped frames. Though the NavigatorObserver should help with that.

[marandaneto]

I don't think this as events or breadcrumbs are useful as they won't know where/how to fix it, this would fit either our measurements or metrics product which is being worked on as we speak.
See eg getsentry/sentry-cocoa#1123
it requires the performance API so its blocked by it

[ueman]

In one of the recent Flutter versions (either 2.5 or 2.8) your now able to read the current frame number and FrameTiming also got a frame number property.

This should make it possible to get at least somewhat useful metrics.

[ueman]

There's also https://api.flutter.dev/flutter/scheduler/SchedulerBinding/addPersistentFrameCallback.html which gets called every frame.