Some datagrams are lost because the NetFlow export uses User Datagram Protocol (UDP) to send them.
Resolving The Problem
You might encounter the following messages on your Netflow enabled flow sources/devices
qflow0: [WARNING] default_Netflow: Missed 1 datagrams from 192.168.1.1:0, Expected sequence #: 1111111111 Received: 1111111110
Cause From Cisco:
Because NetFlow export uses User Datagram Protocol (UDP) to send export datagram's, it is possible for datagram's to be lost. To determine whether or not flow export information is lost, the version 5 header format contains a flow sequence number. The sequence number is equal to the sequence number of the previous plus the number of flows in the previous datagram. After receiving a new datagram, the receiving application can subtract the expected sequence number from the sequence number in the header to get the number of missed flows.
Where do you find more information?
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10 May 2019