As far as I understand, fiware-bosun uses Django server. However, is it possible to deploy it using a different application server (e.g. Apache)?
Fiware-bosun is compound by two different modules:
Both components are recommended to be deployed using gunicorn and you could also add supervisord and Nginx over this layer.
However, of course you can deploy the rule engine using any other application server that supports WSGI (e.g. Apache + mod_wsgi).