== Background
Community consultation: https://de.wikipedia.org/wiki/Wikipedia:Fragen_zur_Wikipedia#Seitenvorschaubilder_(Page_Previews). Results preferred on for anons and new accounts. The changes for new accounts will be tracked under {T191888}. Based on consultation, we should deploy the second change sometime between now and the end of May.
= Blockers
[-] all subtask of epic reviewed and resolved(if not removed as subtasks) - all currently in signoff.
[-] Community consultation for behavior for logged-in users started and any follow ups outlined by @CKoerner_WMF have been added here.
[-] T189906 has been completed and VirtualPageViews is enabled on all wikis
[-] Patches relating to T190188 are on English and German Wikipedia
[x] @CKoerner_WMF has reviewed blockers and ticked this box personally to say they are correct
[-] @ovasileva has reviewed blockers and ticked this box personally to say they are correct
[-] @Jdlrobson has reviewed blockers and ticked this box personally to say they are correct
[] @nirzar has reviewed blockers and ticked this box personally to say they are correct
= Acceptance criteria
[] All boxes in the blockers have been ticked. We're ready to go!
[] Patch is written per developer notes.
[-] Deploy is scheduled and a meeting is added to the calendar. @ABorbaWMF , a design rep and @ovasileva should be available for testing.
= Developer notes
The deploy script should take care of the following
[] wmgUsePopups is currently messy simplify it
```
pp_stage0' => true,
'pp_stage1' => true,
// T172291
'enwiki' => true,
'dewiki' => true,
```
should be:
```
'wikipedia' => true,
```
[] wgPopupsAnonsExperimentalGroupSize should be set to 0 for all wikis ('default'). Counter-intuitively this means Popups is enabled to 100% of anons. Note given the value of wmgUsePopups this will not enable Popups for non-wikipedias
= During deploy
[] Verify that Page previews is showing on all wikipedias for anonymous users and for logged in (only if opted in) - I suggest testing Spanish, German, Hebrew. Be careful to test anonymous behaviour in an incognito window as you may have previously been opted in via the footer)
[] Verify that the [[ https://grafana.wikimedia.org/dashboard/db/eventlogging-schema-jumbo?orgId=1&var-datasource=eqiad%20prometheus%2Fops&var-schema=VirtualPageView | rate of events for VirtualPageViews ]] is still at healthy values (estimated average: ~700-800 events/sec; may be above or below that depending on time of day and day of week). Errors are around normal rate.
[] Verify that page previews remains disabled on all other projects e.g. Wikidata, Wiktionary, English Wikipedia
[] Green light from @ABorbaWMF to sync
[] Green light from @Nirzar to sync
[] Green light from @ovasileva to sync
= Post deploy
[] https://www.mediawiki.org/wiki/Reading/Web/Release_timeline has been updated
[] Update team email li