this post was submitted on 08 Aug 2026
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Way back when, the observed ABAB sequence could be explained by one server using outdated data and another having the new data and visitors being round-robined to each in turn. I have investigated issues like this and this has happened. Not sure how many companies still use a setup like this, though. It's been K8s clusters everywhere I've worked for many years now. This does indeed look like a proper AB test, the HTML already looks pretty clear.
Happens all the time with GitHub Actions when they update runner images. According to Microsoft, it's "fundamentally unfixable".