Operating Cilium at a small scale is straightforward. You install the Helm chart, choose a routing mode, and apply a few network policies. Day 1 is about getting packets to flow. Day 2 is about keeping them boring. At Datadog, we run Cilium across hundreds of Kubernetes clusters, tens of thousands of nodes, and hundreds of thousands of pods in multiple clouds. When operating at this scale, small configuration choices stop being minor details and start becoming risk multipliers.