We have used Splunk to give us insight into the NetFlow of the traffic running through our network. We connect different networks but we only use on-prem. We are in the middle of a spider web, providing these services to different networks. We are trying to gain visibility into the traffic that traverses our network internally.
We are interested in the traffic volume because the services we are looking at are endpoint-encrypted, meaning encrypted traffic between a service provider and a client in another network. So we are not able to look into the media stream.
The networks we are connecting have their own security boundaries and their own security levels, and we don't mess with that. We are just trying to let them talk together.
We have been using Splunk for monitoring who is logging in and how and when.