Multi-channel documentation?

[ahmed-sigmalux]

Feature request

What is the expected behavior?
There should be documentation describing environment variables for multi-channel branch. Without this, I don't know where to start.

What is motivation or use case for adding/changing the behavior?
Using the multi-channel branch.

How should this be implemented in your opinion?
There should be documentation.

Are you willing to work on this yourself?
No.