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I like Mattermost. My only gripe with it is that it's a bit of a pain to upgrade. Would be nice if they were to automate the upgrade procedure.

Check out the Kubernetes operator, which handles zero-downtime upgrades as well as blue/green deployments and canary builds: https://github.com/mattermost/mattermost-operator

We support Mattermost on Cloudron which automates app updates.

disclaimer: co-founder of cloudron.io