To track the impact of our work to implement a better UX for Special:Preferences on mobile, we want to track some data on how users are modifying high-priority settings.
As a system I want to log the following preference events in mobile and desktop:
Password (Special:ChangeCredentials) - submit/save event;
Email address (Special:ChangeEmail) - submit/save event
*NOTES*
- Use the event logging as prescribed https://phabricator.wikimedia.org/T310045