There are few methods with which we can Troubleshoot the Any Line item Under delivery, Creative Preview, Ad request wastage issue in DFP,
DFP by default provides few solution to check the issue with ads. But we should be aware of below methods which help any ad trafficker to resolve any kind of issue
Method 1: Chrome Console
Step 1 : Load the publisher page, press Ctrl+ shift + I, It will open the Chrome Console
Step 2 : Go to “Network Tab” and add the filter as “gampad”. With this filter we will get the AD impression call from DFP
Step 3 : Click on the calls which shows relevant ad sizes, click on it
Step 4 : Go To “Response Header” section and you will be able to see
• google-creative-id: 117020241635,103223853674,-2,103223853674,-2,103223853674,-2
• google-lineitem-id:192648755,28687274,-2,28687274,-2,28687274,-2
Where -2 is the line item serving via Adsense or Adx
Troubleshooting the non-delivery of the line item: How to check source of the ad? To find out the exact tracker called on the page, we need to login to Ghostery which is free service.
Install Ghostery add-on in a browser, it’s available for both Chrome and Firefox.
Ghostery
Once install it will show all the calls made on the page