OneAgent System Monitoring is the component responsible for reporting, among other things, OS level and basic process level metrics. Those will come directly from OS, via a filesystem. However, there is not much we can tell from the screenshot alone, other than the fact that the activity is indeed higher than on our reference environments. Could you kindly create a ticket, where you could share your tenant ID, so that the support team can take a look around it?
As Schneider Electric don't have a Tenant for the Pre-Prod env, I'm using a trial for this server.
If you are ok for having a look on it, just give me your email for the invit.
Here's a new screenshot where we see that the process "OneAgent Monitoring" is more and more high with the metric "I/O Requested write"