[Lens] line color based on threshold

[marco9494]

Describe the feature:
Feature needed for composing line charts with lines that are able to change colors based on the values they are tracking.

Describe a specific use case for the feature:
My use case is referred to a temperature dashoboard: on timeline series I need the line that is tracking the temperature, starts as green and if the value of the temperature is above 26°, the line should become yellow/orange (starting from 26-value of y-axis) and eventually, if it exceeds 28°, starting from the 28-value on Y-axis it has to change to red color.

[jportner]

Seems to be related (duplicate?): #4482

[ghudgins]

+1 during a usability test on #108342 - user wanted the line to change color above the threshold. this really only makes sense if you aren't breaking down by anything or plotting multiple series as the multiple lines would become indistinguishable above the threshold.

[ghudgins]

icons or similar to the points of the graphs where [the value is] above

another case to consider in this issue