For people not following inititial infra ticket about this (https://pagure.io/centos-infra/issue/441) here is a quick status about CentOS Stream 9 availability in CI infra :

Starting from today, each tenant in CI infra can request Stream 9 for the x86_64 architecture.

Due to lack of compatible hardware for ppc64le, it's not available yet but we hope to be able to provide it before end of this year. aarch64 is on the list of architectures to be tested and added (more on that when it will be ready)

We already updated the python-cicoclient to correct version on the previous Virtual Machines setup behind ci.centos.org but we still have (next on the list) to update the cico-workspace container/image to include newer python-cicoclient (see http://mirror.centos.org/centos/7/infra/x86_64/infra-common/Packages/p/pytho...) that is used in the openshift/ocp 4 cluster

Enjoy your tests on Stream 9 !

PS: at the infra side, we'll still have to also have an internal mirror returned by mirrormanager as it's actually using external mirrors, so dnf operations will be "slow" versus what you can see for 7/8/8-stream, but it's on the list