- Service session affinity timeout tests are no longer required for Kubernetes network plugin conformance due to variations in existing implementations. New conformance tests will be developed to better express conformance in future releases. ([#112806](https://github.com/kubernetes/kubernetes/pull/112806), [@dcbw](https://github.com/dcbw)) [SIG Architecture, Network and Testing]

  * Fix the Kubelet PLEG update timestamp to better reflect the health of the component when the container runtime request hangs. ([#45496](https://github.com/kubernetes/kubernetes/pull/45496), [@andyxning](https://github.com/andyxning))

- Implemented logging and event recording for probe results with an `Unknown` status in the kubelet's prober module. This helps in better diagnosing and monitoring cases where container probes return an `Unknown` result, improving the observability and reliability of health checks. ([#125901](https://github.com/kubernetes/kubernetes/pull/125901), [@jralmaraz](https://github.com/jralmaraz))...

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* update QEMU version to v2.9.1 ([#50597](https://github.com/kubernetes/kubernetes/pull/50597), [@dixudx](https://github.com/dixudx))
* controllers backoff better in face of quota denial ([#49142](https://github.com/kubernetes/kubernetes/pull/49142), [@joelsmith](https://github.com/joelsmith))

- We’re working to simplify the Windows node join experience with better scripts and kubeadm. Scripts and doc updates are still in the works, but some of the needed improvements are included in 1.15.  These include:

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* fix network setup in hack/local-up-cluster.sh (https://github.com/kubernetes/kubernetes/pull/60431) ([#60633](https://github.com/kubernetes/kubernetes/pull/60633), [@pohly](https://github.com/pohly))
    * better error diagnostics in hack/local-up-cluster.sh output
* Add prometheus cluster monitoring addon to kube-up ([#62195](https://github.com/kubernetes/kubernetes/pull/62195), [@serathius](https://github.com/serathius))

* Update gogo/protobuf to serialize backward, as to get better performance on deep objects. ([#77355](https://github.com/kubernetes/kubernetes/pull/77355), [@apelisse](https://github.com/apelisse))

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