After an upgrade is successful the old mongo db will still be running on machine 0 (+ maybe 1 and 2 in HA). If there were no workload units deployed to those machines they can just be removed, but if there were we should offer a command (or maybe just a script) to stop and remove the old mongo instances from those machines.
After an upgrade is successful the old mongo db will still be running on machine 0 (+ maybe 1 and 2 in HA). If there were no workload units deployed to those machines they can just be removed, but if there were we should offer a command (or maybe just a script) to stop and remove the old mongo instances from those machines.