The activation of this (amber yellow) "warning" indicates that the engine coolant temperature is high.
It is activated when the temperature reaches 121C (250f).
Note
In this case, ducati recommends stopping and shutting off the engine immediately; make sure that the fans are working.

Low hands free key (hf) battery level
Steering release error - steering still lockedKey-on/key-off using the red key on the handlebar with the active key
A key-on can be performed by pressing the red key (6) on
the handlebar in the hands free on/off position and in
the presence of the active key (3, fig. 77).
Note
The active key (3, fig. 77) Has a range of approx. 1.5 M,
therefore it must be located within this range.
Key-off can be performed ...
Pre-ride checks
Warning
failure to carry out these checks before riding, may
lead to motorcycle damage and injury to rider and passenger.
Before riding, perform a thorough check-up on your bike as
follows:
Fuel level in the tank
Check the fuel level in the tank. Fill tank if needed (page 140).
Engine oil le ...
Engine on/off
Warning
Before starting the engine, become familiar with the
controls you will need to use when riding (page 99).
Warning
Never start or run the engine indoors. Exhaust gases
are toxic and may lead to loss of consciousness or even
death within a short time.
In the presence of the active or ...