What do you think about their new Site Diagnostics?
So far, I'm not seeing any URLs appearing.

Site Diagnostics
View detailed diagnostic information about the pages Google crawls to display relevant ads.

Site Crawler Diagnostics
Our crawler was unable to access the URLs listed below. We encourage you to resolve these issues in order to allow us to crawl more of your pages and provide relevant ads.

For help resolving issues with any blocked URLs, please visit our Help Center

This crawl report is updated weekly, and we are unable to accommodate requests for more frequent crawling. Please also keep in mind that this report is not exhaustive.

Your probably not seeing any URLS because you have no URLs that google are unable to view.

Yes, I think you are right. And I have a lot too.

"Site Diagnostics
View detailed diagnostic information about the pages Google crawls to display relevant ads."

No I think it gives you the info about position and all of those. But check out it says it can only crawl once a week and it just started so Im guessing it's gonna take a while to show any results.

Thank You

I think it is going to be interesting for sure. Hopefully, it will provide some information that helps us better study and monetize our sites.