Structured data team deployed the instrumentation to track search previews (T307572).
The instrumentation spec has been defined in [this document](https://docs.google.com/spreadsheets/d/1drMnPt8mJa8rQRNCCpgkOo_0eQmdDlHDQnLIbjg8syU/edit#gid=0).
==Instrumentation note
The related events will be stored in `mediawiki_searchpreview` schema.
==QA summary
Schema QA in betalabs (T321069#8462307 by @Etonkovidova)
|What has been checked |Status |Note|
|----|----|-----|
|wiki | ✅ pass |recorded|
|action |❓Not all types of events are available in schema | could not trigger the following events: click-article-section, click-interwiki-links; action: 'click-snippet' which is not listed|
|platform |✅ pass | 2 types of source are captured: mobile and desktop|
|result_display_position | ❓ | go to other search page (next 20 search results for example), get `result_display_position: -1` |
|session_id | ❓| null on mobile (it's always not null on desktop) |
|meta |✅ pass |recorded|
|dt |✅ pass| recorded|
Schema QA on production