DRIVERS-1675 : This ticket depends on the driver having implemented the changes from DRIVERS-1677 . Log messages and corresponding tests for connection pool logging were added via this commit . To summarize: New log messages have been added which are very similar to existing CMAP events. Tests in the unified format have been added in a /logging directory under tests. A description of a close operation for client entities has been added to the unified test format. This operation is used in one of the new tests. Existing CMAP tests in the CMAP-specific format were moved into a /cmap-format subdirectory under the /tests directory.