== Background
The WE2.1 KR states: Ensure a quality reading experience for all users by adapting the default experience for 15% of pageviews, based on the individual needs and constraints of the user. We would like to establish a baseline for this metric by looking at at the frequency of how the interface currently adapts
== Acceptance criteria
[] Build out instrumentation for the following metrics, as per the spec in https://docs.google.com/spreadsheets/d/1MrnLq5ZefmGl2YEko5SznpHrUaye2mXutr8MN7lisbo/edit#gid=0
- page preview status
- interface width
- pin status
- media viewer status
== QA
Note: https://grafana.wikimedia.org/d/000000566/overview?orgId=1 may be helpful
- This will impact the live schema so make sure DesktopWebUIClickTracking volume is not impacted
- This will impact the live schema so make sure MobileWebUIClickTracking volume is not impacted
- All events should contain the new accessibility fields