I meant, since I have a number of relays, for Atlas to tell me which ones are not going without having to look into each in detail first.
As far as I can tell, relays that are not running are not included in the search results. You'll only see relays that are active in the consensus. I'm not sure how long they take to drop off though.
What is the use case here though? Monitoring? If so, I think Atlas isn't the best tool for the job.