Explanation Icon constuients

The taskbar icon has superimposed on it from time-to-time, tiny check marks ; RED left side, 0 to 4 of them; Green right side, 0 to 4 of them. They may-or-may-not flash, and they come-and-go.

I have been unable to find what these mean and will appreciate the information from one of you more experienced forum members. Thank you!

From help screenshot

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