* Adds an approval work flow to the certificate approver that will approve certificate signing requests from kubelets that meet all the criteria of kubelet server certificates. ([#46884](https://github.com/kubernetes/kubernetes/pull/46884), [@jcbsmpsn](https://github.com/jcbsmpsn))

    *   `regression_head` now accepts customized link function, to satisfy the
        usage that user can define their own link function if the
        `array_ops.identity` does not meet the requirement.
    *   Fix `initialized_value` and `initial_value` behaviors for
        `ResourceVariables` created from `VariableDef` protos.
    *   Add TensorSpec to represent the specification of Tensors.

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