We've configured our Hetzner servers with terraform, so we can easily spin up a new one in case we notice that we need another slave to handle extra work (1-2 mins). Ansible is responsible for configuring the server, installing all the required packages and software (not all our infrastructure is deployed with Kamal, for instance we have clickhouse instances, DBs, redis etc and normal app slaves). TLDR; it helps us have a new instance up an runing in minutes, or recreating our infrastructure for a new client environment