The activation of this (amber yellow) "warning" indicates that the hands free system has detected that the battery that permits the active key (1, fig. 62) To communicate and turn the vehicle on is almost discharged.
Note
In this case, ducati recommends replacing the battery as soon as possible as described in the paragraph "replacing the active key battery" (page 88).

Hands free key (hf) not recognised
High engine coolant temperatureIndicator speed avg - average speed
This function shows the average speed of the motorcycle.
The calculation is made considering the distance and time
travelled since the last trip 1 reset. When trip 1 is reset, the
value is set to zero and the first available value is shown on
the display 10 seconds after the reset. Dashes &quo ...
Inputs and outputs of engine control unit and connection to can network
The diagram illustrates the inputs and outputs for the engine control unit.
The signals from the brake buttons, the exhaust
by-pass valve command signal and the gear sensor signal are transmitted over the
can line.
1I emergency engine cutout switch
2I start button
4I side stand button
6 ...
Cleaning and replacing the spark plugs
Spark plugs are essential to smooth engine running and
should be checked at regular intervals.
The condition of the spark plugs provides a good indication of
how well the engine is running.
Have the spark plugs inspected or replaced at a ducati dealer
or authorised service centre; they will ...