Which metrics section shows the changes made to your campaign, which optimization s were made, and by whom?

The Activity history section is a dedicated audit log within the X Ads Manager that provides full transparency into the management of your campaigns. It tracks every significant modification—such as budget adjustments, bid changes, or targeting updates—and records the specific time the change occurred as well as the identity of the user who made it. This is an essential tool for teams or agencies because it allows advertisers to correlate specific performance fluctuations with recent optimizations, ensuring accountability and making it easier to troubleshoot or "roll back" strategies if a certain change doesn't yield the desired results.