Number of datagrams received (LBT-RM, LBT-RU, LBT-IPC, LBT-RDMA)

- n (Int32)
- Statistics set index

Number of datagrams received.

Depending on batching settings, a single datagram may contain one or
more messages, or a fragment of a larger message. Larger messages
are split into fragment sizes limited by the transport's configuration
option transport_xxxx_datagram_max_size.
This method returns a value from the nth set of statistics
encapsulated within this object.