Half the time I think they top the fluid off with fluid that gives no protection in cold weather, maybe just water. I prefer to top that off my self.
I know a lot of newer vehicles have a 1 gallon capacity so that you can pour a full gallon jug into the tank and not have to keep a jug hanging around.
I never let it get low enough for a warning to come on, so it is not something I would know or care about.
Nothing in the electrical schematics suggests that their is a level alarm, nor in the owner's manual.
2015 Canyon SLT, Copper Red, 2WD, CC, SB, V6, Tow, blk leather, factory spray liner, safety pkg, generic roll up bed cover.