See DRIVERS-488 for details (note this ticket may be out of date, see up-to-date rendered examples here) .

These examples (or a slightly simpler version) would also be nice to include as doctests in the ClientSession docs page, similar to the pymongo client_session page. We should also update the Error documentation to include information about error labels, similar to what libmongoc has. start_transaction and commit_transaction docs should also be updated to mention the error labels and when the user is safe to retry manually.