I think exact graph not present in the official Dynatrace document, but below link will help you to get the idea about support version and changes.
I hope it will help
It's already answered here to RHEL8:
and we'll adapt to this in RHEL 9 series:
"we will support minor odd updates for 6 months only in alignment with Red Hat support policy (see below). This approach should give you the time to transition to the following version smoothly. "