From December 19 to 21 (roughly coinciding with the deploy of 1.33-wmf.9), the number of mobile visual editor abort events dropped from a stable level to 0. This hasn't happened with any other editor or any other interface.
|mediawiki/extensions/MobileFrontend : master||Log abort events when canceling out of visual editing|
We expected a drop because the patch for T211156 stopped abort (and ready) from being logged when switching from wikitext to visual, which I suspect was a common source (you could look for ones with the abort_type logged as switchnochange).
Absent that... the only source of abort events is directly clicking the cancel button. I'll investigate whether those are being suppressed somehow. (Note that I don't think e.g. pressing the back button or closing the tab would fire one.)
Having checked: mobile VE's only source of abort events was (incorrectly) when switching. It has never emitted them for anything else. I'll improve that, so at least canceling out of it will emit them.
Yes, it is!
select date_format(dt, "yyyy-MM-01") as month, event.abort_type as abort_type, event.abort_mechanism as abort_mechanism, count(*) as mobile_ve_aborts from event_sanitized.editattemptstep where event.platform = "phone" and event.editor_interface = "visualeditor" and event.action = "abort" and year = 2019 group by date_format(dt, "yyyy-MM-01"), event.abort_type, event.abort_mechanism month abort_type abort_mechanism mobile_ve_aborts 2019-02-01 abandon cancel 396 2019-02-01 nochange cancel 3647 2019-03-01 abandon cancel 21988 2019-03-01 nochange cancel 177529