This is the percentage of bytes delivered from Akamai Edge servers versus the bytes delivered from an origin server. It includes both NetStorage and “Your” (custom) origins. This is calculated as follows: (Edge Volume – Ingress Volume) / Edge Volume * 100.
You should typically see a higher value for Edge server traffic. This represents content already accessed from your origin, held in cache, and delivered (quicker) to end users—versus requests to access new content from your origin, that is not yet in cache.