d43ac381_Monitoring_nuget_org__Purpose
[Check] package restore (lookup) [Interval] 1 minute [Notify when down] 3 minutes [Purpose] 
Before NuGet can download a package through the 'package restore (download)' URL, it must first query the API for the package to get its metadata that includes that download URL. This lookup ends up hitting our packages index and serving the results through the API. If this check is down, builds using package restore will fail.
Monitoring nuget.org
Purpose