744315 - Telemetry for slow setTimeout

Status: RESOLVED DUPLICATE of bug 744470

(Core :: DOM: Core & HTML, defect)

Description

[David Teller [:Yoric] - still alive but not very active]

As discussed on IRC, it would be nice to have some Telemetry information on window.setTimeout calls that take too long.

I would say:
- we probably want this only for chrome content-issued setTimeout;
- we probably want to attach the file + line info to the histogram, much as we attach some source code to Telemetry of slow SQL queries;
- how long is "too long"? setTimeouts that are triggered more than 300ms after the expected date, for instance?

Comment 1

[Boris Zbarsky [:bzbarsky]]

> - we probably want this only for chrome content-issued setTimeout;

I'm not sure what that means.

> we probably want to attach the file + line info to the histogram

We can try, but I will bet that in most cases we don't have this....

Comment 2

[(dormant account)]

i'm going to drive this in bug 744470