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# Alpha Features | ||
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Tracking document for alpha features of Kubernetes that etcd operators makes use of. | ||
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We track these alpha features as their behavior may change or be deprecated between Kubernetes versions. | ||
Therefore clusters that use these features need to keep track of any potential changes in upstream releases. | ||
See the upstream [api versioning documentation](https://github.com/kubernetes/community/blob/master/contributors/devel/api_changes.md#alpha-beta-and-stable-versions) for more information. | ||
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### TolerateUnreadyEndpointsAnnotation | ||
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Used by the etcd client and peer service object. | ||
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This alpha annotation will retain the endpoints even if the etcd pod isn't ready. | ||
This feature is always enabled in endpoint controller in k8s even it is alpha. | ||
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References: | ||
- https://github.com/coreos/etcd-operator/issues/622 | ||
- https://github.com/coreos/etcd-operator/issues/1257 |