REST using Tenured Generation

Hi all, I have limited knowledge on java machines and memory usage so looking for some information.    Each day we several of the REST APIs on our app be used by our internal data team, the whole process takes about 15 minutes, and as you can see by the screenshot, the tenured generation shoots up at the same time.   Does anyone know if this is expected behaviour?   This is just one of the avenue we are investigating for memory issues we are having.     
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