What is the new Zscaler offering on Equinix Network Edge?

Here is a blog post that describes the offer at high level: https://www.zscaler.com/blogs/product-insights/secure-private-access-zpa-private-service-edge-equinix-network-edge and the Deployment Guide: https://help.zscaler.com/downloads/zscaler-technology-partners/network/zscaler-and-equinix-deployment-guide/Zscaler-Equinix-Deployment-Guide-FINAL.pdf