Show worker/supervisor ids in app supervision graph

[DiaanEngelbrecht]

Hi there!

TLDR; I added labels to the process nodes to make it more clear what the processes represent.

I was using Kino.Process in Livebook to try and figure out how some elements of the Membrane RTC Engine work. I won't go into the details, but suffice to say this is a foreign code base to me, and it wasn't clear from the get go:

• What the supervision tree looks like.
• How it the internal genservers relate to each other.
• How that ties into my phoenix app.

So I was poking around blindly until I got my RTC Engine's process's graphed with Kino. This is what it looked like for reference:

Cool! So now I get to see the process layout, but I'm still blind as to what all this actually is. I still don't know what Membrane is doing. To get a bit more insight, changed the label for the PID node to also print out the node's id and got this:

This helped me relate my WebRTC endpoints with pid's and I also really like the insight it gives when you plot a Phoenix app's supervision tree.

[josevalim]

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