Show full 100% utilization bar in a different color from 99.9%

[bluikko]

NetBox version

v3.1.4

Feature type

Change to existing functionality

Proposed functionality

I propose when utilization is full, i.e. there is nothing free left, the utilization bar would not show the same red as it shows for 90% or 99.9%.
Instead it could show a (slightly) different color, say brighter/darker red or purple.

Use case

Make it easy for human operator to distinguish from the utilization bar whether utilization is totally full 100%, or not totally full <100%.

Currently the operator cannot just scan the list of utilization bars for whether something is 100% full or almost full because the bar has the same color and may display too similar bar length for 99%/99.9% and 100%.

100% is a slightly special case since there is nothing free left inside, so indicate that to the operator for spotting it easily.

Database changes

None.

External dependencies

None.

[jeremystretch]

The utilization_graph tag used to render these graphs currently supports warning (yellow) and danger (red) thresholds; these default to 75 and 90, respectively. It should be simple to extend this to include a special style/color for 100 values, although we might also need to look into rounding (e.g. 99.99% not being the same as 100%).

[github-actions]

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