In order to provide a baseline to compare usage of the new ORES-based filters against, we should get instrumentation about filter usage early.
We would probably want something like:
- The state of each boolean filter (minor, bots, unregistered, registered, myself, categorization, wikidata*, nondamaging*) for each view of Special:RecentChanges
- The effective value of the namespace filter (if set), taking into account the "Invert" and "Associated namespace" checkboxes
- The value of the tag filter
This task is for adding instrumentation to RC to record this data, but @Neil_P._Quinn_WMF et al should probably weigh in on how we can best instrument this.