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ULS analytics schema update
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Description

Migrated from: https://wikimedia.mingle.thoughtworks.com/projects/language_engineering/cards/4119

Context

ULS analytics schemas must be optimized after a first iteration of analysis. This was recommended by several WMF analytics experts as a good practice.

Narrative

As a product manager in WMF, I can get relevant data about usage, so that I can improve the products.

Acceptance Criteria

  • Remove events that are not useful for analysis.
  • Add events that may be useful.
  • Split a big schema with recycled fields (as UniversalLanguageSelector_7327441 is now) to several small focused schemas.
  • For all of these - update the schema and the ULS code that writes to the schema.