What is a NSG?
A Network security group (NSG) contains a list of security rules that allow or deny network traffic in resources it is connected to. NSGs can be associated to each virtual network subnet and network interface in a virtual machine. For more information, see Network security group overview.
How do I view my NSG’s data?
We can view this data by going back to Network Watcher in the portal and clicking on “Traffic Analytics” under the logs section. This will launch the traffic analytics dashboard which provides visual data on what has been happening with your NSG’s.
What are NSG flow logs in network Watcher?
Network security group (NSG) flow logs are a feature of Network Watcher that allows you to view information about ingress and egress IP traffic through an NSG.