Define threshold for line colours

[mietzen]

Is your feature request related to a problem? Please describe.
Most of my 95% connections are drawn yellow and red despite the network working flawless.

Describe the solution you'd like
I would like to have some variable to define the threshold for line colours, e.g.:

panel_custom:
      zigzag:
        green_threshold: 150
        yellow_threshold: 100
        red_threshold: 50

Additional context
When everything is yellow and red it's hard to see when there is a real problem