When does PH tells you, you have a ALK problem?

Here is my Apex graph from the last 7 days:





The graph seems rather rhythmic with the PH rising when the MH lights are on during the day..... and PH dropping over overnight.



So my question is: what would I see in my PH readings if my Alkalinity went to 10, 12, 14 dKH ????



I want to know the signs if Alk got way too high bc my calc-reactor was dripping too much Alk



Again, looking for an answer in what would tip me off in my PH readings to immediately start testing for ALK????