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for etcd cluster you may want to start here: https://etcd.io/docs/v3.5/

I am working the etcd documentation and using that for reference now. I was just looking for some examples of existing production configurations.

K3s runs etcd as an internal process, so looking at it for "standard etcd config" is probably not the best idea. You instead could look at how RKE2 runs etcd, if you install and run RKE2 you can find the etcd config at

/var/lib/rancher/rke2/server/db/etcd/config

I've attached my config from a random RKE2 cluster I had.