k8s: Avoiding Zombie Cluster Members When Upgrading to etcd v3.6
Kubernetes Official Blog
2025-12-21
Upgrade to etcd v3.5.26 or later before moving to v3.6 to let etcd auto-sync membership data (v3store) from the legacy v2store and prevent removed nodes from reappearing as "zombie" members that can make the cluster inoperable.