Ditto the previous posters.
That is one of the reasons I bring everyone in at night. I clean stalls every morning so that gives me a chance to see the quality of manure every day.
The moistness and consistency of the manure is what's important.
They each generally leave me 3-5 piles thru the night - unless there's going to be a big change in barometric pressure, then they only each leave one or two piles, but will make up for it after the weather change hits. That is no joke - lol lol
As far as pee, that's an individual thing too, unless you notice one of your horses urinating just about every time you look out the window, then it might be time to call the vet.
Also if the urine is brown in color (not to be confused with dark yellow), that indicates blood in the urine and the vet should be called.
Hope this helps some