Node.js trace options

Node.js 7 has command line switches --trace-events-enabled

and --trace-event-categories

, which look promising for debugging simple problems, but the tracing

documentation is rather sparse.

I don't see, for example, a list of what categories of trace events can be specified in command or API level documents. Perhaps there is a command switcher for displaying categories. Is there a tracing category for loading a tracing module that can be used in Error: Cannot find module messages?

Does Node 6 have anything like this in terms of tracking module load?