It cost reddit a 3 hour outage.
>The nodeSelector and peerSelector for the route reflectors target the label `node-role.kubernetes.io/master`. In the 1.20 series, Kubernetes changed its terminology from “master” to “control-plane.” And in 1.24, they removed references to “master,” even from running clusters. This is the cause of our outage.
https://old.reddit.com/r/RedditEng/comments/11xx5o0/you_brok...
I never did understand what they felt was wrong about git master, there was no slave or even work involved. it was more like the master print of a video. you know the thing that "remasters" are made from.