[GOAL] Tidy up EventLogging
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Authored By

	phuedx
	Oct 23 2025, 5:27 AM

Description

EventLogging was the home for all code related to analytics instrumentation at WMF. It contains code relating to:

The so-called Legacy EventLogging system, which was superseded by the Event Platform fully in FY 24/25
The validation of JSONSchema schemata, whereas MediaWiki Core and very nearly all other all extensions use the justin-rainbow/json-schema or opis/json-schema libraries
Early attempts to introduce higher-level concepts, e.g. the mw.eventLog.Schema class
The Metrics Platform, including deprecated and soon-to-be-deprecated methods like mw.eventLog.dispatch() and mw.eventLog.newInstrument()

Tidying up EventLogging will help to clarify its purpose and its relationship to the Event Platform, the Metrics Platform, and Experimentation Lab.

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Status	Subtype	Assigned	Task
Open		None	T408059 [GOAL] Tidy up EventLogging
Open		None	T317874 [EPIC] Deprecate mw.eventLog.logEvent()
Resolved		phuedx	T317525 Decommission the ChangesListFilterGrouping instrument
Resolved		phuedx	T316229 Decommission the ContentTranslation instruments using legacy EventLogging schemas
Open		None	T305491 Deprecate/delete the mw.eventLog.Schema class
Open		None	T317793 [EPIC] Deprecate EventLogging::schemaValidate()
Open		None	T318263 [EPIC] Deprecate EventLogging::logEvent()
Resolved		phuedx	T397611 Decommission the TwoColConflictConflict and -Exit instruments
Resolved		phuedx	T352969 Deprecate and remove MetricsClient#dispatch()
Invalid		SGupta-WMF	T352869 Migrate SpecialDiff instrument to use submitClick()
Resolved		Sfaci	T350497 Update the WikiLambda instrumentation to use core interaction events
Resolved		phuedx	T355438 Remove the Wikilambda monoschema instrument and its configuration
Resolved		phuedx	T351335 Remove partial migration of EditAttemptStep instrument
Resolved		Sfaci	T351337 Remove partial migration of VisualEditorFeatureUse instrument
Resolved		Frostly	T354419 Remove EventLogging::submitMetricsEvent()
Resolved	BUG REPORT	phuedx	T353366 Remove WikimediaEvents diff instrumentation
Resolved		Sfaci	T354822 [JS] Remove dispatch method
Resolved		phuedx	T354823 [PHP] Remove dispatch method
Resolved		phuedx	T354821 Remove events key from Metrics Platform stream configs
Resolved		cjming	T354819 [Java] Refactor api submit methods to require stream name
Resolved		phuedx	T355045 Update JS and PHP Metrics Platform Client consistency tests
Resolved	Spike	phuedx	T355046 [SPIKE] Remove mentions of MetricsClient#dispatch() and the monoschema from documentation
Open		None	T367034 MetricsPlatform Extension: Migrate JS and PHP Client Libraries
Open		None	T408091 [EPIC] Deprecate and remove mw.eventLog.newInstrument()
Open		None	T408093 Mark mw.eventLog.newInstrument() as deprecated
Open		None	T408094 Decouple mw.xLab.getInstrument() and mw.eventLog.newInstrument()
Open		None	T408097 Remove mw.eventLog.newInstrument()
Open		phuedx	T414218 Remove mw.eventLog.newInstrument() call from ClickThroughRateInstrument
Open		None	T414572 Migrate all instruments using mw.eventLog.newInstrument to mw.testKitchen.getInstrument()
Open		phuedx	T408096 Migrate 1 instrument using mw.eventLog.newInstrument() to mw.xLab.getInstrument()
Open		None	T408177 [EPIC] Deprecate and remove mw.eventLog.id
Resolved		phuedx	T408178 Decommission the Wikistories instruments
Open		None	T408179 Remove mw.eventLog.id
Declined		None	T313784 Document the mw.eventLog.id API
Open		None	T384687 Don't delay event submission