We had a replicaset with a member who no longer existed.
Iunno if someone added a host that no longer existed to the replset or if someone straight up deleted the host while it was a member of the replset.
It destroyed our ability to query mongos. period. rather worry-some.
rs.remove() the bad host
rs.add() a new host
and was able to query mongos again. yeck.
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