- phab:T169730 (titled "Define and implement instrumentation for printing on desktop web", however the schema was also activated on mobile web/Minerva)
- phab:T181297 "Instrument print to PDF button"
Sampling rate and method
As of September 2017: 10% of all distinct browser sessions, determined using the pseudorandom mw.user.sessionId() value (an ephemeral cookie)
Each action is only logged once per page view. That is, no matter how many times the user clicks on 'Printable Version', only one 'clickPrintableVersion' action is logged for that page until the page is refreshed. Ditto the `onBeforePrint` action.