NSG flow logs support for outbound traffics via NAT Gateway
For outbound traffics from VMs associated with NAT Gateway, NSG Flow logs won't show the correct destination public IP in the logs. While this is due to the internal design of NAT Gateway and it's the expected behavior, users may be confused by observing un unfamiliar IP address.
As all destination IP addresses are recorded as the same internal VIP, the flow logs no longer makes sense (for outbound). This is a big problem for customers who would like to monitor traffics, and leaving this as it is will affect user experiences strongly.
Eizenga, Marcel commented
The ability to log all outgoing data is very important. NSG flow logs and/or sending the logs to Log Analytics is a must in my shops.