Infrastructure metrics have always been focused on speeds and feeds. Throughput, packets per second, connections per second, etc… These metrics have been used to evaluate and compare network infrastructure for years, ultimately being used as a critical component in data center design.
This makes sense. After all, it’s not rocket science to figure out that a firewall capable of handling 10,000 connections per second (CPS) will overwhelm a next hop (load balancer, A/V scanner, etc… ) device only capable of 5,000 CPS.