703715 - Add Telemetry probes for sync XHR

Status: RESOLVED FIXED

Description

[Olli Pettay [:smaug]]

Sync XHR in Window context is terrible, and if just possible we should get rid of it.
(it may takes years to achieve that)

Comment 1

[Olli Pettay [:smaug]]

Created attachment 575543 [details] [diff] [review]
patch

Comment 2

[Jonas Sicking (:sicking) No longer reading bugmail consistently]

Comment on attachment 575543 [details] [diff] [review]
patch

Assuming this will let us see how man async as well as sync requests are made.

It'd be awesome if we could get a count on how many sites out there use sync XHR, but I don't see a way of doing that without effectively sending the domain name of the site to us, which would be terrible privacy.

Comment 3

[Olli Pettay [:smaug]]

This counts all the open() calls, and either increases the async bar (0), or sync bar(1), so yes
it is easy to check how many XHR open calls there has been, and how many of those have been sync.

Comment 4

[(dormant account)]

Comment on attachment 575543 [details] [diff] [review]
patch

dont need empty lines in TelemetryHistograms.h

Comment 5

[Olli Pettay [:smaug]]

https://hg.mozilla.org/mozilla-central/rev/714cd1b8ad93
https://hg.mozilla.org/mozilla-central/rev/7dd46087e678