The email confirmation banner experiment currently has a severe SRM. Although the TK setup is configured as a 50/50 split between control and arm_a, the observed sample is heavily skewed toward control.
The current code can count control exposure even when no email-confirmation banner eligibility exists.
| Status | Subtype | Assigned | Task | ||
|---|---|---|---|---|---|
| Resolved | mmartorana | T421366 Test Kitchen Experiment setup to measure the impact of the banner | |||
| Resolved | mmartorana | T425677 SRM for email confirmation banner experiment |
Change #1284661 had a related patch set uploaded (by Mmartorana; author: Mmartorana):
[mediawiki/extensions/WikimediaEvents@master] Make email confirmation banner a standalone RL module
Change #1284661 merged by jenkins-bot:
[mediawiki/extensions/WikimediaEvents@master] Make email confirmation banner a standalone RL module
Change #1284771 had a related patch set uploaded (by Mmartorana; author: Mmartorana):
[mediawiki/extensions/WikimediaEvents@wmf/1.47.0-wmf.1] Make email confirmation banner a standalone RL module
Change #1284771 merged by jenkins-bot:
[mediawiki/extensions/WikimediaEvents@wmf/1.47.0-wmf.1] Make email confirmation banner a standalone RL module
Mentioned in SAL (#wikimedia-operations) [2026-05-07T20:07:34Z] <arlolra@deploy1003> Started scap sync-world: Backport for [[gerrit:1284687|Provide page context for LintErrorChecker (T419596)]], [[gerrit:1284771|Make email confirmation banner a standalone RL module (T425677)]]
Mentioned in SAL (#wikimedia-operations) [2026-05-07T20:09:23Z] <arlolra@deploy1003> arlolra, mmartorana: Backport for [[gerrit:1284687|Provide page context for LintErrorChecker (T419596)]], [[gerrit:1284771|Make email confirmation banner a standalone RL module (T425677)]] synced to the testservers (see https://wikitech.wikimedia.org/wiki/Mwdebug). Changes can now be verified there.
Mentioned in SAL (#wikimedia-operations) [2026-05-07T20:14:52Z] <arlolra@deploy1003> Finished scap sync-world: Backport for [[gerrit:1284687|Provide page context for LintErrorChecker (T419596)]], [[gerrit:1284771|Make email confirmation banner a standalone RL module (T425677)]] (duration: 07m 18s)