Does this include temp accounts? I see performer_is_temp in the spec as a contextual attributes.

For reference, there is already an A/A test for logged out reader retention, which can perhaps be used as guidance on how to implement this:

https://gerrit.wikimedia.org/r/plugins/gitiles/mediawiki/extensions/WikimediaEvents/+/r[…]xt.wikimediaEvents/testKitchen/loggedOutReaderRetention.js

Does this include temp accounts? I see performer_is_temp in the spec as a contextual attributes.

We want to analyze users with logged_in = true and performer_is_temp = false. It’s unclear whether temporary accounts will be bucketed into the experiment. If they are, we will filter them out in the analysis using the performer_is_temp field.

Change #1261546 had a related patch set uploaded (by Anne Tomasevich; author: Anne Tomasevich):

[mediawiki/extensions/WikimediaEvents@master] Add logged-in reader retention instrument

https://gerrit.wikimedia.org/r/1261546

With the patch in gerrit, I can see the events with my local test kitchen setup the same way as Wikimedia's test kitchen:

{
    "instrument_name": "LoggedInReaderRetention",
    "experiment": {
        "enrolled": "logged-in-retention-group1",
        "assigned": "control",
        "subject_id": "5e183e37d760ee0a8c8f5ae84273c94b03150b815bda9e9e3ab645bf22b20ea8",
        "sampling_unit": "mw-user",
        "coordinator": "default"
    },
    "$schema": "/analytics/product_metrics/web/base/2.0.0",
    "meta": {
        "domain": "enwiki.mediawiki.local.wmftest.net",
        "stream": "product_metrics.web_base",
        "id": "9511a6c8-9ada-4f55-a894-5d3d8ba676af",
        "dt": "2026-03-27T14:09:27.170Z",
        "request_id": "90ad2800-29e6-11f1-82ed-f55ba206b6ea"
    },
    "dt": "2026-03-27T14:09:24.875Z",
    "action": "page-visited",
    "agent": {
        "client_platform": "mediawiki_js",
        "client_platform_family": "desktop_browser"
    },
    "mediawiki": {
        "database": "enwiki",
        "skin": "vector-2022"
    },
    "page": {
        "content_language": "en",
        "id": 615,
        "namespace_id": 0,
        "title": "Democratic Republic of the Congo"
    },
    "performer": {
        "is_bot": false,
        "is_logged_in": true,
        "is_temp": false,
        "name": "Admin",
        "session_id": "477cae5ad6cf88f92c4d"
    },
    "http": {
        "request_headers": {
            "user-agent": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/145.0.0.0 Safari/537.36"
        }
    }
}

do we want to collect the page information for each page visit?

I think the page details come from using the product_metrics.web_base stream locally, but we would setup a new stream (mediawiki.product_metrics.reader_experiments) that has more narrow set of contextual attributes?

Next steps:

• We need to setup a custom stream in mediawiki-config in ext-EventStreamConfig.php
• add it to wgTestKitchenExperimentStreamNames in InitialiseSettings.php
• also add it to wgEventLoggingStreamNames in ext-EventLogging.php

Ensure the that loggedInReaderRetention.js calls setStream. (can use the reading list a/b test as an example)

Change #1264630 had a related patch set uploaded (by Anne Tomasevich; author: Anne Tomasevich):

[operations/mediawiki-config@master] Add event stream for logged-in reader retention experiment

https://gerrit.wikimedia.org/r/1264630

Change #1264630 merged by jenkins-bot:

[operations/mediawiki-config@master] Add event stream for logged-in reader retention experiment

https://gerrit.wikimedia.org/r/1264630

Mentioned in SAL (#wikimedia-operations) [2026-03-30T20:59:53Z] <cjming@deploy1003> Started scap sync-world: Backport for [[gerrit:1264630|Add event stream for logged-in reader retention experiment (T420490)]]

Mentioned in SAL (#wikimedia-operations) [2026-03-30T21:02:02Z] <cjming@deploy1003> cjming, annet: Backport for [[gerrit:1264630|Add event stream for logged-in reader retention experiment (T420490)]] synced to the testservers (see https://wikitech.wikimedia.org/wiki/Mwdebug). Changes can now be verified there.

Mentioned in SAL (#wikimedia-operations) [2026-03-30T21:06:56Z] <cjming@deploy1003> Finished scap sync-world: Backport for [[gerrit:1264630|Add event stream for logged-in reader retention experiment (T420490)]] (duration: 07m 04s)

Confirming that the experiment is turned on in test kitchen with data collection beginning tomorrow as the related code rides the train to all wikis

Change #1261546 merged by jenkins-bot:

[mediawiki/extensions/WikimediaEvents@master] Add logged-in reader retention instrument

https://gerrit.wikimedia.org/r/1261546

Change #1267008 had a related patch set uploaded (by Anne Tomasevich; author: Anne Tomasevich):

[mediawiki/extensions/WikimediaEvents@wmf/1.46.0-wmf.22] Add logged-in reader retention instrument

https://gerrit.wikimedia.org/r/1267008

Change #1267008 merged by jenkins-bot:

[mediawiki/extensions/WikimediaEvents@wmf/1.46.0-wmf.22] Add logged-in reader retention instrument

https://gerrit.wikimedia.org/r/1267008

Mentioned in SAL (#wikimedia-operations) [2026-04-02T20:52:10Z] <kemayo@deploy1003> Started scap sync-world: Backport for [[gerrit:1267008|Add logged-in reader retention instrument (T420490)]]

Mentioned in SAL (#wikimedia-operations) [2026-04-02T20:53:51Z] <kemayo@deploy1003> annet, kemayo: Backport for [[gerrit:1267008|Add logged-in reader retention instrument (T420490)]] synced to the testservers (see https://wikitech.wikimedia.org/wiki/Mwdebug). Changes can now be verified there.

Mentioned in SAL (#wikimedia-operations) [2026-04-02T21:03:50Z] <kemayo@deploy1003> Finished scap sync-world: Backport for [[gerrit:1267008|Add logged-in reader retention instrument (T420490)]] (duration: 11m 40s)