Beginning the week of February 20, Google is updating the metrics on the reach report in DCM (Doubleclick adserver).
According to Google, “a number of reach report metrics in DCM will be renamed. This renaming will modify both API names and column header names in generated report files. These changes are being made to prevent confusion as new reach reports and metrics are developed.”
This update is just a renaming of the column headers and introduces the word cookie.