The color suggests an interpretation to the viewer when
actual values cross the threshold. Comments on each color
provide UX guidance on how users can be expected to interpret a
given state color.
Values:
COLOR_UNSPECIFIED (0):
Color is unspecified. Not allowed in
well-formed requests.
YELLOW (4):
Crossing the threshold is "concerning"
behavior.
RED (6):
Crossing the threshold is "emergency"
behavior.
