As of SERVER-35638, the message "Warning: unable to run listCollections, attempting to approximate collection names by parsing connectionStatus" no longer appears when running "show collections" on a pre-4.0 MongoDB server.
As of SERVER-35638, the message "Warning: unable to run listCollections, attempting to approximate collection names by parsing connectionStatus" no longer appears when running "show collections" on a pre-4.0 MongoDB server.