Discussion around Container Linux EOL day

See What was CoreOS and CoreOS container Linux - Container Linux has been EOL since May but many artifacts were still available. In order to avoid people unintentionally running an EOL operating system, the artifacts are going away.

I’m starting this thread as a “transition to FCOS” (or OKD/OpenShift/something else) reference - ideally any posts around successful migrations (“war stories” are great!) but also unsuccessful migrations or whether you chose to do something else entirely are also welcome!