Key metrics for monitoring etcd

The article details how to effectively scale Kubernetes clusters while minimizing etcd resource usage—a common bottleneck. It advocates for strategically partitioning state across multiple etcd instances using a technique called "lease-based sharding," reducing the load on any single etcd member and allowing for continued growth with a smaller overall etcd cluster size. This approach focuses on ephemeral state like Pod lifecycle data, lessening the burden on etcd compared to storing persistent cluster configuration.