What's the feature?

Enhance OVN utilities (either an ovn-appctl command or a standalone binary) that will create a visual representation of the incremental processing engine of ovn-northd/controller (e.g., dot format or mermaid).

Why is it needed?

Reasoning on the code where I-P engine nodes are defined for ovn-controller and ovn-northd is hard, people prefer visual alternatives.

Today devs have to manually figure out the dependencies between incremental processing nodes by directly extracting that information from ovn-controller.c and inc-proc-northd.c code.

As we add more incremental processing to OVN (to improve performance) having a clear view of the data dependencies is critical.

Who will benefit? 

OVN developers