TheWikipediaLibrary notification will be going out to an estimated 20,000-30,000 editors when first deployed. Rather than notify all these editors simultaneously, potentially overwhelming the Library Card platform as a result, we want to roll it out in stages to different groups of users.
We discussed in T269849#6728833 (and onwards) that a strategy based on total edit count is likely to be easiest to implement. The threshold can be lowered over time manually via config change deployments.
Based on the English Wikipedia editor breakdown, we expect an edit count-based rollout to approximately break down as follows:
| Edit count | Cumulative total |
| > 10k edits | 13% |
| > 4k edits | 32% |
| > 1k edits | 63% |
| > 500 edits | 100% |
This allows us to start small, with just over 10% of eligible editors, and monitor for issues as we ramp up over time.