Kubernetes 1.6 delivered support for 5000-node clusters, improved multi-user scheduling and security (RBAC), dynamic storage provisioning and more — a major scale & stability milestone.
Cluster Federation in Kubernetes 1.5: Managing Multi-Cluster Deployments
Kubernetes 1.5 delivered StatefulSet & PodDisruptionBudget (beta), the Container Runtime Interface, and broadened production readiness across runtimes and platforms.
KubeCon 2016 introduced Service Catalog and the Open Service Broker API, connecting Kubernetes to external services.
Kubernetes 1.4 introduced kubeadm, expanded security (RBAC beta), CRI groundwork, and made 'Kubernetes Anywhere' a reality.
Kubernetes 1.3 bridged cloud-native and enterprise workloads with PetSet (alpha), 5,000-node scale, and the first taste of cluster federation.
Overview of Kubernetes 1.2 — scale to 1,000 nodes, new declarative APIs (Deployment, ConfigMap), and a richer autoscaling story.
Overview of the official Kubernetes 1.0 release — the first stable Kubernetes release from Google, marking the birth of CNCF and cloud-native orchestration.