To make sure no active onions are removed by mistake, the unit test should try to ping all addresses for three passes separated by 5 minutes. The script should be run 3 times in the space of one week to make sure that it didn’t run into domains during maintenance downtime.
My reason for the first part, even if it sounds redundant, is when contacting Zwitterion the site timed out the first two times and connected successfully. So the site may be working but rendezvous points are acting up.