More Granular Telementry Events around request lifecycle?

Hi all,

I’m using the Spandex library to instrument my phoenix app. Back when Phoenix supported instrumenters, Spandex was able to produce spans around the controller action and view rendering.

Now with telemetry, we only have the router_dispatch and endpoint events.

Would people find value in wrapping the controller action and rendering with start, stop, exception metrics?

If people are interested, I could probably get a PR together fairly quickly. Also if there are any other pieces you’d like to see telemetrized, feel free to make suggestions.