Fill color for area mode (normal utilization).
Stroke color for area mode line (normal).
Fill color for area mode (over-allocated region).
Stroke color for area mode line (over-allocated).
Border radius of histogram bars.
Gradient start color for bars within capacity.
Gradient end color for bars within capacity.
Gradient start color for bars exceeding capacity.
Gradient end color for bars exceeding capacity.
Scale factor: 1.5 means 100% capacity = 2/3 of available row height.
Color of the capacity threshold line.
Style of the threshold line.
Width of the threshold line in pixels.
Histogram-specific visual style.