psutil (https://pythonhosted.org/psutil/) is awesome for collecting valuable monitoring information.

pyrasite (http://pyrasite.com/) will let you inject code into a process. This can be used to add monitoring of private internal state etc (if you have no other options).

If you want to have locally hosted graphs then grafana and influx are my current tools of choice.

It is going to be more work than swiping a credit card, but not a crazy amount.