In PYTHON-1668 I would have wanted to verify readConcern and writeConcern for queries logged to mongod.log. I couldn't see those, even if readPreference is logged. I also am not aware of another way to log readConcern or writeConcern, but admittedly didn't try the debug log levels.

I don't know if we can add more info to slow query logging, bur readConcern and writeConcern seem like a big deal, for example compared to readPreference.