Which metrics section displays changes made to your campaign or ad group, and which optimization s were made and by whom?

The Activity history metrics section shows a detailed log of all changes made to your campaign or ad group, including what optimizations were applied and who made them. This helps advertisers track edits, monitor performance adjustments, and maintain accountability, ensuring that every change—whether manual or automated—is documented. Other sections like breakdowns by creative or device focus on performance data, not on tracking changes.