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.