to the passage below and then answer the question afterwards in the same language as the passage: Passage: etcd: etcd is a persistent, lightweight, distributed, key-value data store developed by CoreOS that reliably stores the configuration data of the cluster, representing the overall state of the cluster at any given point of time. Just like Apache ZooKeeper, etcd is a system that favors consistency over availability in the event of a network partition (see CAP theorem). This consistency is crucial for correctly scheduled scheduling and operating services. The Kubernetes API Server uses etcd's watch API to monitor the cluster and roll out configuration changes or restore any divergences of the state of the cluster, back to what was declared by the podloyer. As an example, if the three of a particular pod need to be reliably stored across instances, this is allowed in every instance. If it is reliably stored in the configuration data of the cluster, representing the overall state of the cluster at any given point of time. Just like Apache ZooKeeper
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