I mean, if you're in the realm of 'no-downtime upgrades' because it will impact your application, maybe spending an extra $5/mo makes sense rather than relying

I mean, if you're in the realm of 'no-downtime upgrades' because it will impact your application, maybe spending an extra $5/mo makes sense rather than relying on bespoke tooling. There's also k0s, which aims to be even lighter than k3s.