[service-announce] CentOS 8 Stream End of Life and Removal from OpenDev CI

Hello everyone, I wanted to give you a heads up that CentOS 8 Stream has reached its end of life and the upstream package repos have been removed. Our mirrors have faithfully replicated the empty mirror content (there is only a readme file now [0]). The end result of which is failing CI jobs if the jobs run on CentOS 8 Stream. The OpenDev team intends on removing these nodes from Zuul and Nodepool in the near future as jobs can no longer successfully run on CentOS 8 Stream. Projects should check their CI jobs (on older branches too) and either remove jobs that rely on CentOS 8 Stream or update those jobs to run on a different platform. [0] https://mirror.dfw.rax.opendev.org/centos/8-stream/readme Clark