(Информация о версии неизвестна, возможно, только в SVN)
Введение
In version 1.2.0 of the driver, built-in connection pooling was introduced.
This class gives you some control and information about pooling.
Замечание:
The functions in this class were originally static members of
Mongo. It is highly recommended that you use these
functions in the future, as the static Mongo
functions are considered deprecated.