Given that the migration of Netbox to the nextbox dedicated hosts has been concluded and it's now running since a while and we're surely not coming back, we should cleanup the Netbox stuff from the netmon hosts unless they are scheduled to be reimaged soon.
A not complete list of things to cleanup:
- any remaining puppet code
- anything not cleaned up by Puppet (either because ensure:absent was not used or not supported):
- ACME certs, see T238900#5683710