== Background
We will be performing an A/B test on enwiki and dewiki to gauge the performance of the page previews feature, especially in relation to fundraising.
Note that we're removing EventLogging instrumentation sampling from Page Previews in {T172291} so it's hard to guess at an ideal bucket size from previous sampling rates.
== Acceptance Criteria
[] Launch A/B test
[] Notify DBA and Analytics Engineering when launching, per T172322#3533459 (and keep monitoring [[https://grafana.wikimedia.org/dashboard/file/server-board.json?var-server=dbstore1002&refresh=1m&orgId=1&panelId=17&fullscreen |EL disk usage]] ourselves)
== Questions
[x] What are the bucket sizes for each group per project?
@phuedx:
| wiki | on:off:control |
| -- | -- |
| enwiki | 0.003:0.003:0.994 |
| dewiki | 0.008:0.008:0.984 |
With the caveat that these numbers are based on a peak rates rather than an average rates.
[x] What's the maximum rate of events that we can send?
@Tbayer: Depends on the overall amount of data generated in combination with current disk space concerns, see {T172322}