Identity Fragmentation: Cilium's Emerging Scalability Bottleneck in Large Kubernetes Deployments

As Kubernetes clusters scale to millions of pods, Cilium's ipcache—the critical component mapping pod identities to security policies—faces severe performance degradation driven by how identities distribute across the cluster. Fragmented identity patterns cause hash collisions, memory exhaustion, and policy enforcement gaps that directly threaten cluster security and stability. Understanding and optimizing identity distribution has become essential for organizations operating large-scale Kubernetes environments.