VMware Cloud Director 10.x
If the end to end network MTU between the source and the destination is not consistent, packets can be fragmented and cause the message from being accurately assembled at the destination log aggregator. Moreover, if there is a syslog relay, there are circumstances where messages may be truncated, which can result in similar symptoms.
Confirm that there is a consistent end-to-end MTU in the network path between VMware Cloud Director and the log aggregator.
Please note, since syslog message are delivered using UDP, which is a connectionless protocol, additional issues can be encountered as network utilization and scale increases. This could include dropped packets during congestion, since the packets would not be retransmitted, changes in packet order due to traversal of different paths, etc.