Wow. Looking through git history it looks like the Redis version hasn’t been in 5.x range for two years! But I know we’ve done some successful upgrades along the way (including git pulls).
Based on Skip Redis Version Check, it looks like they recently started getting enforced. I’ve already dug a big enough hole for a Friday and don’t want to try upgrading our data container without some help… so, I’ll try reverting to an even earlier version of docker_discourse to see if I can get to back to a state where the Redis requirement isn’t enforced for now (until we can get our data container updated).