We deploy via a train which progressively rolls out code on the course of the week.
On Wednesday's we currently deploy to 2 Wikipedia's: Catalan and Hebrew. We deploy to all over Wikipedia's on Thursday.
These wikis are indispensable for catching and fixing bugs before the train completes. However, due to the size, many bugs get overlooked until the Thursday.
Having a larger (by page view/number of editors) wiki in that group would likely avoid many issues remaining in our software over weekends.
Getting software earlier should be a no-brainer for communities - they get bugs fixed and new features much quicker and are less likely to have bugs remain in their software during the Thursday lunchtime-Monday morning period.
From a product point of view, it is hypothesized that a larger wiki in group 1 will help give greater confidence about our software and report issues earlier so they can be addressed more timely.
Based on project sizes, having one of the following Wikipedias would be ideal:
* Spanish
* Russian
* Chinese
* Portuguese
* Japanese
* German
* French
* Italian
* Polish
Ideally, these communities should have active users on Phabricator who can help report issues that do arise. For this reason, I lean more towards German, French, Italian and Polish as the communities that would be useful.