They are files that are generated by System Monitor and Performance Logs and Alerts applications (or any application that is installed and measures some sort of performance). They are supposed to be deleted after a reboot but can be orphaned if something crashes. You should be able to stop the System Monitor and Performance Logs services and then delete them (you may have to do it in Safe Mode).
"everything will be ok in the end. if it's not ok, it's not the end" - unknown


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