We use Skylight to monitor the performance of our network on different sites. We also use it to troubleshoot if there is an issue on the network/standard and the end user experience is good.
Recently, we used Skylight to monitor the amount of external user VPNs. With COVID-19, we have many people who work at home. We used Skylight to count the number of users and monitor the Internet line to see if there was a point of saturation.
It is mostly deployed on-premise with some services in the cloud.