I had that recently when there were gallons of condensation on the inside of the windshield and the camera couldn't see. It remained on for the longest time and reset itself as I was driving once the condensation dissipated. I kinda figured it was due to the condensation, but had there been a less obvious blockage, I'm not certain I would have understood exactly what the problem was.
These functions are affected by the blocked visibility, should not be relied upon and may trigger warning lights:
>High Beam Control System (HBC)
>Lane-keep Assist System (LAS) & Lane Departure Warning System (LDWS)
>Traffic Sign Recognition System (TSR)
>Advanced Smart City Brake Support (Advanced SCBS)
>Smart City Brake Support (SCBS)
>Mazda Radar Cruise Control with Stop & Go function (MRCC with Stop & Go function)
>Smart Brake Support (SBS)
There is that warning on the speedometer display, and warning lights for the above features may turn on. I can't find the specific speedometer warning verbiage in the manual.
There's another one I saw for the first time the other day: "Please Keep Your Hands On The Steering Wheel." Nag, nag, nag.
Oh. To answer your specific question. The Warning Lights Reference in the USA Manual begins on Page 4-25. I can find no comprehensive list of Warning Messages in the multi-function display. The manual merely lists "Warning Messages" as one of the items shown on the Display. As I said, when discussing camera obstructions, the manual merely says you will "see a warning message" if the camera is blocked for any reason.
I can find nothing on the web. I've never seen any discussion of this in any video or review I've watched/read.