This article applies to all JSDR software versions.
After a JetStream DR upgrade has been started from the Management Server Appliance (MSA) using the command js_upgrade.py upgrade -v it creates the a file /tmp/last_upgrade.log that lists details about the upgrade.
The upgrade command can be run with the -v option to expose more details:
Refer to the following article for information about upgrading the MSA: https://jetstreamsoft.atlassian.net/wiki/spaces/JSKB1/pages/2464776232