> Enable limited “instant” config rollouts

Hmm, I think "config" is too vague here. I've seen numerous incidents caused by NGINX config changes that would have been far worse if we had instant 100% rollouts, but I'm not sure this is the kind of config change the author is referring to.

> Run 3 of everything

What is a "thing" in this example? Is it an instance of a service? A database? Something else?

If you're using Kubernetes and have autoscaling, what does "3 of everything" even mean? It sounds like the author is basically talking about databases..?