WMDE is about to run a campaign reaching out to occasional editors to encourage them to keep on editing. For evaluation purposes we want to measure the effect of the banners on editing frequency, which would need to be broken down to user accounts.
The documentation states that user related data is logged alongside the actual event schema when an event is triggered by a logged-in user, including the user ID. The EventCapsule schema on meta and the actual capsule code do not contain this field, though.
I can think of a good reason not to include data that qualifies for identifying specific users, but I still want to ask: Am I missing something? Is this data hidden/restricted to be accessible only to specific user groups? Or is the documentation simply diverging from the actual behaviour/functionality?