The text outlines the complexities organizations face when transitioning from a permissive to a restrictive egress traffic policy in Kubernetes environments. Initially, organizations often allow open internet access for agility, but as their Kubernetes use grows, the need for stringent security measures becomes paramount. Tools like Cilium and AWS VPC CNI can help enforce deny-by-default policies, but implementing these without disrupting services is challenging. Datadog's Cloud Network Monitoring (CNM) assists by providing detailed insights into network traffic, enabling organizations to identify which Kubernetes namespaces require internet access. The text explains how to use CNM to gather traffic data, create lists of namespaces based on their internet access needs, and apply targeted network policies to restrict egress traffic effectively. This ensures a secure environment while maintaining necessary connectivity, using either Cilium or AWS VPC CNI for policy implementation.