Comment 4 for bug 1844568

There is an AttachInterfacesTestJSON that expects and handles the 400 error so we have to filter that out to get a decent logstash query with mostly failures:

http://logstash.openstack.org/#dashboard/file/logstash.json?query=message%3A%5C%22HTTP%20exception%20thrown%3A%20Multiple%20possible%20networks%20found%2C%20use%20a%20Network%20ID%20to%20be%20more%20specific.%5C%22%20AND%20NOT%20message%3A%5C%22AttachInterfacesTestJSON%5C%22%20AND%20tags%3A%5C%22screen-n-api.txt%5C%22&from=7d