checkMK 2.1 site set up via APIs or scripts?

[r.sander (Robert Sander)]

@ajo

Or is it as simple as just setting up from the GUI then seeing what it looks like in the .mk files and then figure it out how to dump this into scripts?

For some things, yes. Not everything can be done via API but all of the configuration resides in text files.

Some things can be automated by calling omd config set VAR VAL with the variables shown in the output of omd config show.