They're not out of beta. See this comment [0] on the GitHub issue titled "StatefulSets", which was made on February 3, 2017, and says: >This is beta. May have

They're not out of beta. See this comment [0] on the GitHub issue titled "StatefulSets", which was made on February 3, 2017, and says: >This is beta. May have minor changes in 1.6 but not going GA. The latest release of k8s is 1.6, made on March 28, 2017, about two weeks ago. [1] Furthermore, the issue still bears the "stage/beta" tag. [0] https://github.com/kubernetes/features/issues/137#issuecomment-277368629 https://github.com/kubernetes/features/issues/137#issuecomme... [1] https://github.com/kubernetes/kubernetes/releases/tag/v1.6.0 https://github.com/kubernetes/kubernetes/releases/tag/v1.6.0