Upgrade Geo HA installation from 12.2.8 to the latest 12.3 package [SUCCESS]

Versions

Current: 12.2.8 Target: 12.3.5

Upgrade checklist

Preflight

• Create a zoom meeting and schedule a recorded meeting (make sure you have a paid account, otherwise recordings will stop after 40 minutes)
• Check if the Geo HA update instructions contain version specific changes
• Check if PostgreSQL version is updated
• Check if any upgrade warnings exist
• Verify that the Geo cluster is healthy pre upgrade
• Find the latest packaged version of GitLab that can be used for zero downtime upgrades

Upgrade

• Retrieve a beverage of choice within a drinkable temperature range
• Join Zoom meeting and wait for arrival. Hit the record button
• Perform upgrade steps described in latest documentation
• Record any issues encountered during the upgrade
• Verify cluster health post upgrade
• Verify PostgreSQL version is correct

Postflight

• Record the upgrade outcome as SUCCESS, FAILED, PARTIAL SUCCESS
• Open new issues and inform @rnienaber and @fzimmer to confirm next steps