AWS forced my hand when I took over an environment and upgraded my RDS from 9 to 12. I'm a bit concerned if I restart any atlassian products they will fail to come up after the upgrade (atm everything is running fine except for the DB check).
What is the best way to remedy this situation?
You'll need to move back to a supported postgres version. Ideally, directly, by taking a database export of the v12 one and restoring it into a v9. But you might want to try the xml export if that won't work. (Problem with the xml export is that it reads the entire database, so if there are problems with v12, you may lose the data from the export)
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