The protocol was leaking into the product's vocabulary. A machine you own is a Server now — in the migration form, on the Credentials page (the tab is Servers), on the landing page, in the plan comparison and throughout the docs. The API is untouched: sourceType: "ssh", sshServerId and the rest are unchanged, and the API reference still documents them as they are.

Alongside it: jobs always connect out from one fixed address, and that address is now shown where you'd want it — in the migration form, in the Add Server dialog and in the migration guide. You can allow a single IP on your SSH port instead of opening it to the internet.