1648284 - Add a telemetry probe to record the number of pending input events when a timeout handler is about to run

Status: RESOLVED FIXED

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

Description

[Sean Feng [:sefeng211]]

In bug 1644284, we plan to do more setTimeout tweaks by deferring it when there are important pending input events.

Before we start, we'd like to have a telemetry probe to see how often it happens.

Comment 1

[Sean Feng [:sefeng211]]

Attachment: Bug 1648284 - Record the number of pending critical input events r=smaug

This telemetry is mainly used for bug 1644284. We'd like to tell
how often do we run timeout handlers when there are a lot of
pending input events.

Once we know the data, we can use it to do further setTimeout
improvements.

Comment 2

[Sean Feng [:sefeng211]]

Attachment: data_collection_review.txt

Comment 3

[Tim Smith (inactive) 👨‍🔬 [:tdsmith]]

Comment on attachment 9159728 [details]
data_collection_review.txt

lgtm; thanks!
--

1) Is there or will there be **documentation** that describes the schema for the ultimate data set in a public, complete, and accurate way? 

Yes, through the probe dictionary and Histograms.json.

2) Is there a control mechanism that allows the user to turn the data collection on and off?

Yes, the Firefox telemetry opt-out.

3) If the request is for permanent data collection, is there someone who will monitor the data over time?

n/a

4) Using the **[category system of data types](https://wiki.mozilla.org/Firefox/Data_Collection)** on the Mozilla wiki, what collection type of data do the requested measurements fall under?

Category 1, technical data.

5) Is the data collection request for default-on or default-off?

Default-on.

6) Does the instrumentation include the addition of **any *new* identifiers** (whether anonymous or otherwise; e.g., username, random IDs, etc.  See the appendix for more details)?

No.

7) Is the data collection covered by the existing Firefox privacy notice?

Yes.

8) Does there need to be a check-in in the future to determine whether to renew the data?

sefeng is responsible for renewing as needed.

9) Does the data collection use a third-party collection tool?

No.

Comment 4

[Pulsebot]

Pushed by [e-mail]:
https://hg.mozilla.org/integration/autoland/rev/b6a6c9c513da
Record the number of pending critical input events r=smaug

Comment 5

[Noemi Erli[:noemi_erli]]

https://hg.mozilla.org/mozilla-central/rev/b6a6c9c513da

Comment 6

[Sean Feng [:sefeng211]]

Attachment: input_telemetry_release_data.png

Screenshot of the stats from Release.

Comment 7

[Sean Feng [:sefeng211]]

Attachment: input_telemetry_beta_0.png

Screenshot of the stats from Beta.

Comment 8

[Sean Feng [:sefeng211]]

Attachment: input_telemetry_nightly_0.png

Screenshot of the stats from Nightly.