In OCP 4.7  and before, you were able to see the MCD logs of the previous container post upgrade. Now it seems that we no longer do in newer versions. I am not sure if this is a change in kube pod logging behaviour, how the pod gets shutdown and brought up, or something in the MCO.

This however makes it relatively hard to debug in newer versions of the MCO, and in numerous bugs we could not pinpoint the source of the issue since we no longer have necessary logs. We should find a way to properly save the previous boot MCD logs if possible.