⚓ T412146 Launch Mobile Expanded Sections on non-English wikis

Subject	Repo	Branch	Lines +/-
Test Kitchen: StickyHeaders experiment hotfix	mediawiki/extensions/WikimediaEvents	wmf/1.46.0-wmf.5	+2 -2
Test Kitchen: StickyHeaders experiment hotfix	mediawiki/extensions/WikimediaEvents	master	+2 -2
Backport: Instrument sticky header session length to 1.46.0-wmf.5	mediawiki/extensions/WikimediaEvents	wmf/1.46.0-wmf.5	+188 -74

SherryYang-WMF created this task.Dec 9 2025, 5:55 PM

Restricted Application added a subscriber: Aklapper. · View Herald TranscriptDec 9 2025, 5:55 PM

SherryYang-WMF triaged this task as High priority.Dec 9 2025, 6:01 PM

SherryYang-WMF set the point value for this task to 2.

mfossati updated the task description. (Show Details)Dec 9 2025, 7:11 PM

mfossati added a subscriber: EBlackorby-WMF.

Change #1216848 had a related patch set uploaded (by Kimberly Sarabia; author: Kimberly Sarabia):

[mediawiki/extensions/WikimediaEvents@wmf/1.46.0-wmf.5] Backport: Instrument sticky header session length to 1.46.0-wmf.5

https://gerrit.wikimedia.org/r/1216848

gerritbot added a project: Patch-For-Review.Dec 9 2025, 8:26 PM

egardner moved this task from Committed to Doing on the Reader Growth Team (Sprint 6 (Dec 10 - EOY) Q2 25/26) board.Dec 9 2025, 8:58 PM

Change #1216848 merged by jenkins-bot:

[mediawiki/extensions/WikimediaEvents@wmf/1.46.0-wmf.5] Backport: Instrument sticky header session length to 1.46.0-wmf.5

https://gerrit.wikimedia.org/r/1216848

Mentioned in SAL (#wikimedia-operations) [2025-12-09T21:05:04Z] <egardner@deploy2002> Started scap sync-world: Backport for [[gerrit:1216848|Backport: Instrument sticky header session length to 1.46.0-wmf.5 (T412146)]], [[gerrit:1216850|Fix scroll-on-collapse (T411868 T411869)]], [[gerrit:1216851|Fix heading background positioning (T412054)]]

Stashbot mentioned this in T411868: Fix iOS browsers scroll-to-top when collapsing a section.Dec 9 2025, 9:05 PM

Mentioned in SAL (#wikimedia-operations) [2025-12-09T21:08:31Z] <egardner@deploy2002> egardner, ksarabia: Backport for [[gerrit:1216848|Backport: Instrument sticky header session length to 1.46.0-wmf.5 (T412146)]], [[gerrit:1216850|Fix scroll-on-collapse (T411868 T411869)]], [[gerrit:1216851|Fix heading background positioning (T412054)]] synced to the testservers (see https://wikitech.wikimedia.org/wiki/Mwdebug). Changes can now be verified there.

egardner claimed this task.Dec 9 2025, 9:08 PM

egardner updated the task description. (Show Details)

Mentioned in SAL (#wikimedia-operations) [2025-12-09T21:13:29Z] <egardner@deploy2002> Finished scap sync-world: Backport for [[gerrit:1216848|Backport: Instrument sticky header session length to 1.46.0-wmf.5 (T412146)]], [[gerrit:1216850|Fix scroll-on-collapse (T411868 T411869)]], [[gerrit:1216851|Fix heading background positioning (T412054)]] (duration: 08m 26s)

egardner updated the task description. (Show Details)Dec 9 2025, 9:24 PM

Maintenance_bot removed a project: Patch-For-Review.Dec 9 2025, 9:31 PM

ReleaseTaggerBot added a project: MW-1.46-notes (1.46.0-wmf.5; 2025-12-02).Dec 9 2025, 10:00 PM

mfossati mentioned this in T410533: Extend SessionLengthInstrumentMixin to support xLab Experiments.Dec 10 2025, 9:48 AM

mfossati mentioned this in T409324: StickyHeaders: Instrument the feature.

mfossati updated the task description. (Show Details)Dec 10 2025, 10:51 AM

mfossati updated Other Assignee, added: mfossati.

Data QA

Enrollment override via browser's console:

mw.xLab.overrideExperimentGroup('sticky-headers', 'treatment')
mw.xLab.clearExperimentOverrides()
mw.xLab.overrideExperimentGroup('sticky-headers', 'control')

Arabic - https://ar.wikipedia.org/wiki/%D8%A8%D8%A7%D8%B1%D9%8A%D8%B3 ✅
Chinese - https://zh.wikipedia.org/wiki/%E5%B7%B4%E9%BB%8E ✅
French - https://fr.wikipedia.org/wiki/Paris ✅
Indonesian - https://id.wikipedia.org/wiki/Paris ✅
Vietnamese - https://vi.wikipedia.org/wiki/Paris ✅

mfossati updated the task description. (Show Details)Dec 10 2025, 11:23 AM

mfossati added a project: FY2025-26 WE3.1 Engaging New Audiences.Dec 10 2025, 11:27 AM

Change #1217485 had a related patch set uploaded (by Marco Fossati; author: Marco Fossati):

[mediawiki/extensions/ReaderExperiments@master] StickyHeaders: refactor features gating

https://gerrit.wikimedia.org/r/1217485

gerritbot added a project: Patch-For-Review.Dec 11 2025, 11:20 AM

Change #1217571 had a related patch set uploaded (by Marco Fossati; author: Marco Fossati):

[mediawiki/extensions/WikimediaEvents@master] Test Kitchen: StickyHeaders experiment hotfix

https://gerrit.wikimedia.org/r/1217571

Change #1217571 merged by jenkins-bot:

[mediawiki/extensions/WikimediaEvents@master] Test Kitchen: StickyHeaders experiment hotfix

https://gerrit.wikimedia.org/r/1217571

Change #1217576 had a related patch set uploaded (by Clare Ming; author: Marco Fossati):

[mediawiki/extensions/WikimediaEvents@wmf/1.46.0-wmf.5] Test Kitchen: StickyHeaders experiment hotfix

https://gerrit.wikimedia.org/r/1217576

ReleaseTaggerBot edited projects, added MW-1.46-notes (1.46.0-wmf.7; 2025-12-16); removed MW-1.46-notes (1.46.0-wmf.5; 2025-12-02).Dec 11 2025, 8:00 PM

dr0ptp4kt mentioned this in T412448: ErrorBudgetBurn (sticky-headers).Dec 11 2025, 8:02 PM

Change #1217576 merged by jenkins-bot:

[mediawiki/extensions/WikimediaEvents@wmf/1.46.0-wmf.5] Test Kitchen: StickyHeaders experiment hotfix

https://gerrit.wikimedia.org/r/1217576

Mentioned in SAL (#wikimedia-operations) [2025-12-11T21:45:48Z] <dani@deploy2002> Started scap sync-world: Backport for [[gerrit:1217557|Undeploy 2025 Global Readers Survey (T410918)]], [[gerrit:1217576|Test Kitchen: StickyHeaders experiment hotfix (T412146)]]

Mentioned in SAL (#wikimedia-operations) [2025-12-11T21:47:47Z] <dani@deploy2002> dani, cjming: Backport for [[gerrit:1217557|Undeploy 2025 Global Readers Survey (T410918)]], [[gerrit:1217576|Test Kitchen: StickyHeaders experiment hotfix (T412146)]] synced to the testservers (see https://wikitech.wikimedia.org/wiki/Mwdebug). Changes can now be verified there.

Mentioned in SAL (#wikimedia-operations) [2025-12-11T21:54:55Z] <dani@deploy2002> Finished scap sync-world: Backport for [[gerrit:1217557|Undeploy 2025 Global Readers Survey (T410918)]], [[gerrit:1217576|Test Kitchen: StickyHeaders experiment hotfix (T412146)]] (duration: 09m 07s)

ReleaseTaggerBot edited projects, added MW-1.46-notes (1.46.0-wmf.5; 2025-12-02); removed MW-1.46-notes (1.46.0-wmf.7; 2025-12-16).Dec 11 2025, 10:00 PM

dr0ptp4kt mentioned this in T412467: ErrorBudgetBurn (sticky-headers, part 2).Dec 12 2025, 2:21 AM

Kafka events QA

Sample of the 1k most recent events via kafkacat -C -b kafka-jumbo1016.eqiad.wmnet:9092 -t eqiad.mediawiki.product_metrics.readerexperiments_stickyheaders -o -1000 -e | jq '.':