Northern Trail Outfitters (NTO) stores customer purchase data in an external system. NTO ingests this data into Marketing Cloud through a file drop automation. The automation contains an import activity which overwrites a staging data extension, as well as an SQL Query activity which brings this data into a sendable data extension.

NTO's marketing manager wants to be informed if more than 1,000 records are ever imported through this automation and would also like to prevent the sendable data extension from being updated that day.

Which solution is appropriate in this situation?