- Recovery from etcd-backup part of e2e testing (kubernetes-retired#596)
- Publicly published upstream conformance tests
- How-it-works documentation for bootkube
- Documentation for running HA clusters (kubernetes-retired#311)
- Versioned configuration objects replace flags (kubernetes-retired#565)
- Kubelet TLS bootstrap/rotation for client/server certificates (kubernetes/enhancements#43 & kubernetes/enhancements#266)
- componentConfig/configMap for all core components
- Cluster configuration object (kubernetes/kubernetes#19831)
- Adoption of kubelet checkpointing / deprecation of pod-checkpointer (kubernetes/kubernetes#489)