When we set wiredtiger verbosity levels like here, wiredtiger does work to generate verbose messages. These messages are returned in this callback to the server and will be logged based on the mongo verbosity level. By default, mongo verbosity levels are 0 so we end up suppressing these messages.

If wiredtiger verbosity levels are set, we should be able to correctly map that to mongo log levels and use that instead of overriding it with the mongo log level.

This may have been introduced during SERVER-61744.