[escardin]

Conceptually this is exactly what Terraform is made for. It will deploy things with the parallelism rate you specify, and is designed to neatly scale your infra up and down.

To do a rolling deployment though, it does become awkward, as you essentially have to model both the old version and the new version in your code, and then run the commands several times to scale up the new cluster and scale down the old one in stages. It's basically a modelling of a blue/green deploy.