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Maniphest T414729

Add Experiment#sendExposure method to SDKs
Closed, ResolvedPublic3 Estimated Story Points
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Description

Experiment implementations should include a call to Experiment#sendExposure() for producing an exposure event which will be used in GrowthBook's experiment assignment queries to:

  • establish each subject's earliest exposure to a variation
  • determine if any subject was exposed to more than one variation

Specification

PropertyValue
action"experiment_exposure"

Acceptance criteria

Details

Related Changes in Gerrit:
SubjectRepoBranchLines +/-
JS and PHP SDK: Add sendExposure methodmediawiki/extensions/TestKitchenmaster+277 -11
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Event Timeline

mpopov created this task.Jan 15 2026, 8:35 PM
mpopov mentioned this in T414735: Document guidelines, scenarios, and recommendations on exposure logging.Jan 15 2026, 8:52 PM
KReid-WMF triaged this task as High priority.Jan 20 2026, 5:41 PM
KReid-WMF updated the task description. (Show Details)
KReid-WMF moved this task from Incoming to READY TO GROOM on the Test Kitchen board.
cjming mentioned this in T412028: [SPIKE] Scope bringing Kotlin SDK up to date.Jan 22 2026, 10:46 AM
mpopov updated the task description. (Show Details)Jan 22 2026, 8:46 PM
cjming mentioned this in T415858: [Epic] Bring Test Kitchen Kotlin SDK to functional parity with JS + PHP.Jan 29 2026, 6:30 AM
KReid-WMF edited projects, added Test Kitchen (Experiment Platform Sprint 19); removed Test Kitchen.Jan 29 2026, 4:32 PM
KReid-WMF updated the task description. (Show Details)
KReid-WMF set the point value for this task to 3.
mpopov mentioned this in T416199: [Revise Tone] Investigate observed impact on constructive activation.Feb 4 2026, 10:15 PM
Sfaci claimed this task.Feb 9 2026, 3:47 PM
Sfaci moved this task from Ready for Development to In Progress on the Test Kitchen (Experiment Platform Sprint 19) board.
gerritbot added a comment.Feb 12 2026, 10:25 AM

Change #1239018 had a related patch set uploaded (by Santiago Faci; author: Santiago Faci):

[mediawiki/extensions/TestKitchen@master] JS and PHP SDK: Add logExposure method

https://gerrit.wikimedia.org/r/1239018

gerritbot added a project: Patch-For-Review.Feb 12 2026, 10:25 AM
Sfaci updated the task description. (Show Details)Feb 12 2026, 3:24 PM
Sfaci moved this task from In Progress to Needs Review on the Test Kitchen (Experiment Platform Sprint 19) board.Feb 12 2026, 3:51 PM
Sfaci added a comment.Feb 17 2026, 10:40 PM

Per slack conversation we agreed on implementing a sendExposure method instead of logExposure as we planned initially in this ticket. That way the new method will be aligned with send which is the existing method that JS and PHP SDK use to send events.

The submitted patch above has been updated accordingly

gerritbot added a comment.Feb 19 2026, 12:17 PM

Change #1239018 merged by jenkins-bot:

[mediawiki/extensions/TestKitchen@master] JS and PHP SDK: Add sendExposure method

https://gerrit.wikimedia.org/r/1239018

Maintenance_bot removed a project: Patch-For-Review.Feb 19 2026, 12:30 PM
phuedx moved this task from Needs Review to To Deploy on the Test Kitchen (Experiment Platform Sprint 19) board.Feb 19 2026, 1:14 PM
KReid-WMF edited projects, added Test Kitchen (Experiment Platform Sprint 20); removed Test Kitchen (Experiment Platform Sprint 19).Feb 19 2026, 4:09 PM
KReid-WMF moved this task from Ready for Development to To Deploy on the Test Kitchen (Experiment Platform Sprint 20) board.
mpopov renamed this task from Add Experiment#logExposure method to SDKs to Add Experiment#sendExposure method to SDKs.Feb 25 2026, 8:41 PM
mpopov updated the task description. (Show Details)
Sfaci moved this task from To Deploy to In Progress on the Test Kitchen (Experiment Platform Sprint 20) board.Feb 27 2026, 7:21 PM
mpopov updated the task description. (Show Details)Feb 27 2026, 10:54 PM
KReid-WMF edited projects, added Test Kitchen (Experiment Platform Sprint 21); removed Test Kitchen (Experiment Platform Sprint 20).Mar 12 2026, 3:09 PM
KReid-WMF moved this task from Ready for Development to In Progress on the Test Kitchen (Experiment Platform Sprint 21) board.
KReid-WMF moved this task from In Progress to Done on the Test Kitchen (Experiment Platform Sprint 21) board.Mar 12 2026, 3:29 PM
mpopov moved this task from Done to In Progress on the Test Kitchen (Experiment Platform Sprint 21) board.Mar 16 2026, 3:13 PM

https://wikitech.wikimedia.org/wiki/Test_Kitchen/Conduct_an_experiment still needs some documentation of exposure

Michael awarded a token.Mar 16 2026, 6:03 PM
Michael subscribed.
Sfaci added a comment.Mar 17 2026, 11:26 AM
In T414729#11714091, @mpopov wrote:

https://wikitech.wikimedia.org/wiki/Test_Kitchen/Conduct_an_experiment still needs some documentation of exposure

If I'm not remembering wrongly, we moved it to Done because we already had T414735: Document guidelines, scenarios, and recommendations on exposure logging to work on related documentation. Is that correct?

mpopov added a comment.Mar 17 2026, 1:47 PM

We discussed it in the standup meeting yesterday and I clarified (and then updated the task description) that we still need basic usage documented on https://wikitech.wikimedia.org/wiki/Test_Kitchen/Conduct_an_experiment, because how else would developers know to use this method?

The other task is now about writing a guide to exposure logging specifically, with the guide being on https://wikitech.wikimedia.org/wiki/Test_Kitchen/Experiment_exposure_logging (and then linked to from the Conduct page)

Sfaci added a comment.Mar 17 2026, 1:48 PM
In T414729#11718617, @mpopov wrote:

We discussed it in the standup meeting yesterday and I clarified (and then updated the task description) that we still need basic usage documented on https://wikitech.wikimedia.org/wiki/Test_Kitchen/Conduct_an_experiment, because how else would developers know to use this method?

The other task is now about writing a guide to exposure logging specifically, with the guide being on https://wikitech.wikimedia.org/wiki/Test_Kitchen/Experiment_exposure_logging (and then linked to from the Conduct page)

Oops! You are right! Now I'm remembering what you say. Thanks!

Sfaci updated the task description. (Show Details)Mar 18 2026, 1:13 PM
Sfaci updated the task description. (Show Details)
Sfaci moved this task from In Progress to Needs Review on the Test Kitchen (Experiment Platform Sprint 21) board.Mar 18 2026, 2:17 PM
Sfaci added a comment.EditedMar 18 2026, 2:20 PM

Regarding the missing work here, the one that corresponds to the Documentation of API:

Sfaci updated the task description. (Show Details)Mar 18 2026, 2:24 PM
Sfaci updated the task description. (Show Details)
mpopov updated the task description. (Show Details)Mar 21 2026, 8:32 PM
mpopov updated the task description. (Show Details)
mpopov moved this task from Needs Review to Done on the Test Kitchen (Experiment Platform Sprint 21) board.

Updated the docs. Task now all done! Thank you very much, Santi!

mpopov closed this task as Resolved.Mar 25 2026, 6:17 PM
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