Decreasing impressions for campaign

Problem

A campaign sees weakened delivery and too few impressions to meet set targets

Investigate

• Has there been a change in targeting or creatives to the campaign?
• Verifying if the decrease is limited to certain sites or across all targeted inventory
• Has any other other campaign(s) started that targets the same inventory, but bids a higher CPM?
• Has there been a decrease in number of bids, or a decrease in win rate?
• Use Bid Metrics to understand in detail what happens during campaign targeting