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If it's fairly new construction, I'd start with the pool company. Good luck

Its fixable need to see it though

I was able to view the picture by copying and pasting the link. What's the scale? Those look very close to the edge...is that correct? Is this a recent development or not? Is it all the way around the pool? It could just be superficial cracking that can be patched. However, if it is an indication that the whole lip is wanting to spall off, that edge might need to be chipped out and redone. Another possibility is that the pool was poured, and then a second pour was done for the apron around the pool. Since the inner perimeter of the apron may be supported by the pool and the rest of the apron is supported by soil, if there has been any settling in the soil under the apron over the years, the cracking could be occurring because the apron has settled a bit, but not uniformly.

I would definitely contact a pool installation company because pools are a specialty and standard concrete installers might not be able to diagnose the possible problem as well.

Here is a link that might be useful: