As noted last month the OpenDev [0] team intends on removing CentOS 8 images from our CI system now that the release has gone EOL. A number of you have already shifted over to CentOS 8 Stream in CI (thank you!), but there is still quite a bit remaining based on codesearch and some manual digging. The OpenDev team has begun the process of removing some of the supporting infrastructure and testing as well [1].
This list is probably not comprehensive but is a start. These projects will need to look at removing their CentOS 8 CI jobs (optionally replacing them with CentOS 8 Stream jobs):
* openstack-chef