Certified Site Metrics are metrics that are directly-measured from the website instead of estimated.
Site owners who install the Alexa Certify Code on their website can choose to display their Certified Metrics, such as Monthly Unique Visitors and Pageviews, if they wish.
Daily Pageviews per Visitor Estimated daily unique pageviews per visitor on the site.
Daily Time on Site Estimated daily time on site (mm:ss) per visitor to the site.
There is not necessarily a link between the upstream site and this site.
The "Sites Linking In" count shows the number of sites that Alexa found that link to this site.