Even if it's been there always you can optimise it and turn off logging for non interesting traffic. But to find the source of spike of events: PA FW saves these reports daily. I guess you have to check past reports, find out on which day there was a spike, which rule recorded it and (in the unlikely case you still have logs for that day) you can find out which traffic caused it. If you don't have logs you can check other automated reports and look for possible causes.
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