1437496 - No relevant histograms are displayed on the latest Nightly

Status: RESOLVED INVALID

(Toolkit :: Telemetry, defect)

Description

[Marius Coman [:mcoman], Ecosystem QA, PTO until 20th of October, for any testing requests ping :poiegas]

Attachment: rec of the issue.gif

[Affected Platforms]:
- All Windows
- All Mac
- All Linux

[Prerequisites]:
- Have a new Firefox profile.
- Have the "network.http.tailing.enabled" pref. set to "false" in the "about:config" page.

[Steps to reproduce]:
1. Open the browser with the profile from prerequisites and navigate to any website.
2. Open a new tab and navigate to about:telemetry>Histograms.
3. Click the selector from the top right part of the page and select the "content" process.
4. Focus the search field from the top-right part of the page.
5. Write the "TIME_TO_LOAD_EVENT_START_MS" string and the observe the behavior.

[Expected result]:
- The "TIME_TO_LOAD_EVENT_START_MS" histogram is displayed.

[Actual result]:
- The "Sorry! There are no results in Histograms for “TIME_TO_LOAD_EVENT_START_MS”" message is displayed.

[Regression window]:
Last good revision: 5faab9e619901b1513fd4ca137747231be550def
First bad revision: 3d23e6d98a09a3395bf2b0d9cb03dd4be358c715
Pushlog:
https://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=5faab9e619901b1513fd4ca137747231be550def&tochange=3d23e6d98a09a3395bf2b0d9cb03dd4be358c715

[Notes]:
- The issue is reproducible if the "network.http.tailing.enabled" pref. set to "true" in the "about:config" page.
- The issue is also reproducible if the following strings are used: 
	"TIME_TO_NON_BLANK_PAINT_MS"; 
	"TIME_TO_DOM_CONTENT_LOADED_START_MS"; 
	"TIME_TO_DOM_INTERACTIVE_MS"
- The issue is not reproducible on Firefox Beta (59.0b8).
- Attached a screen recording of the issue.

Comment 1

[Honza Bambas (:mayhemer)]

I can reproduce independently of the network.http.tailing.enabled preference value.  This is not a networking bug.

Comment 2

[Chris H-C :chutten]

This is as expected as TIME_TO_LOAD_EVENT_START_MS expires in version 60[1]. All of the other mentioned probes are also expired in 60. Nightly is at 60, so the probes have expired (ie, are not recording).

[1]: https://searchfox.org/mozilla-central/rev/b9f1a4ecba48b2d8c686669e32d109c40e927b48/toolkit/components/telemetry/Histograms.json#13373

Comment 3

[Chris H-C :chutten]

It sounds as though these probes continue to be useful and used. Please bump the expiry five versions and request Data Collection Review, and we'll get them recording again in a jiffy.

If these probes will be useful indefinitely, you'll need to make a case for non-expiry, include some automated tests for them, set them to "expires_in_version": "never", and then request Data Collection Review.