It looks like response times are captured and reported for the
localhost domain, but there do not appear to be any request paths.
SELECT * FROM MobileRequest, MobileRequestError where requestDomain like '%localhost%' since 1 week ago LIMIT MAX
The drop down list (where the error message is) for a particular domain in Http Requests is faceted by request path.
You can filter by the domain
localhost, and again by requestPath and see a count for
Occurrences with no value for "Request Path".
Since there are no values for request paths, there is no data to populate that list.