So you do a text search in Mendix Studio Pro on "Periodic statistics" for example and you find nothing?
Are you using an appstore component for managing scheduled events such as https://marketplace.mendix.com/link/component/1750 or https://marketplace.mendix.com/link/component/435?
Maybe that triggers execution of a scheduled event? In that case you should log in to the app and access the maintenance pages for that component to check it out.
I hope this helps.