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when you are doing OS maintenance k3s gets restarted - that should be enough ? > Any certificates that are expired, or within 90 days of expiring, are automatically renewed every time K3s starts. https://docs.k3s.io/cli/certificate?_highlight=certificates#rotating-client-and-server-certificates

I know that, but I find this method inefficient given the scale of my infrastructure. With six clusters and around 80 nodes, I would have to login to each node sequentially to restart the k3s process, which is quite cumbersome to me.

with that many nodes I am sure your org have some automation tools

All right, I would like to raise an issue on GitHub, thanks a lot

We have no plans to expand the expiration date of our certificates. If you are managing that many nodes, using rancher for cluster managements or at least some script tooling like ansible is the recommended course of action.