We've supported multiple servers for a few years and have had official k3s support since the beginning of the year, so not just one server anymore. We even support managing the servers associated in a k3s-based cluster.
Ohhh, I stand corrected. I don't think that was an option the last time I looked at Dokku. I see the schedulers section in the docs now, thanks for pointing it out!
Does the k3s scheduler work with existing non-k3s k8s clusters as well?
Disclaimer: I am the Dokku maintainer.