Runtime.Sys Memory Usage

My number of measurements and number of series has been constant for the last week or so, however last night, at 4pm, my memory usage jumped from 2 GB to 8GB.
All of this is in the “runtime.sys” metric in internals.

Can anyone give any guidance on what that is?

@David_Cohendo do you have any CQs running on the instance that could have triggered that? Or any other processes?

There are 0 continuous queries, and 1 alert running through kapacitor, but that has been there weeks.

Is there any stat you would look at specifically?