Hi,
Your solution works on 1.6.0, but they changed the code quite significantly in 2.0, so that’s no longer valid.
However your reply gave me an idea, so I went and searched for the same region lines in my 2.0 installation…
So, for anyone else that may run into this:
You can edit the file below and add an extra line for the extra region (replace ‘sitename’ with your own checkmk site name)
/opt/omd/sites/sitename/lib/check_mk/utils/aws_constants.py
save changes to the file, then restart checkmk (‘omd stop’ then ‘omd start’).
After checkmk comes back up, do a full inventory scan on your AWS host object. It may take some time for CheckMK pull in the new zones from AWS. Mine took about 5 mins before new services started showing up for the new region, but it does work.