The Python Async Actions example is confusing in my humble opinion. I'm not entirely sure how this functionality works.

If you run the code in the example, no output is displayed and the application immediately ends. I believe this occurs because the main thread terminates and the remaining threads are marked a

The documentation says:

Avoid modifying the engine inside action blocks (i.e., asserting and retracting facts and installing new rules). There are safer ways of doing this.

I see the better way to assert fact upon matching action is to use gen. But I don't see how to retract facts.

Current behavior (how does the issue manifest):
The examples that demonstrate how to use the rules action within a flogo app.json are not documented.

Expected behavior:
Document the usage of the samples via a README in the corresponding samples directory