== Background
One of the main questions from {T294503} is whether readers understand the purpose of a talk page on mobile once exposed to it. We are gathering information on this through a few different factors. This task will focus on one of those factors - the amount of time an anonymous user spends on a talk page.
Instrumentation spec: https://docs.google.com/spreadsheets/d/11o7ZBtFff2Bi2L0kD-qC1c4XS82QqVs8fjcms824aO0/edit#gid=0
== Acceptance criteria
[] Restore/rebuild the reading depth schema as a means of measuring the average time spent on a page per namespace
[] The schema should be logged to on mobile
[] The schema should be logged to on desktop
[] The WikimediaEvents code should replace the call `mw.track( 'event.' + SCHEMA_NAME, data );` with the modern alternative
[] Ensure the following breakdown dimensions are available (all should be there except access method):
- namespace
- Wiki
- isAnon
- access_method
- skin
[] Add chart to https://grafana.wikimedia.org/d/000000566/overview?orgId=1&from=1637551776168&to=1637600395530 to track avg events/seconds