scalability testing in a continuous integration (CI) environment. The SIG
defined a concrete process for scalability testing, created
documentation for the current scalability thresholds, and defined a new set of
Service Level Indicators (SLIs) and Service Level Objectives (SLOs) for the system.
Here's the release [scalability validation report].

[SIG Scalability]: https://github.com/kubernetes/community/tree/master/sig-scalability

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- Kubeadm: fix panic when no UpgradeConfiguration was found in the config file ([#130312](https://github.com/kubernetes/kubernetes/pull/130312), [@neolit123](https://github.com/neolit123)) [SIG Cluster Lifecycle]
- Makes kubelet's /metrics/slis endpoint always available ([#130084](https://github.com/kubernetes/kubernetes/pull/130084), [@richabanker](https://github.com/richabanker)) [SIG Architecture, Instrumentation and Node]

## Changelog since v1.28.6

## Changes by Kind

### Feature

- Add process_start_time_seconds to /metrics/slis endpoint of all components ([#122750](https://github.com/kubernetes/kubernetes/pull/122750), [@richabanker](https://github.com/richabanker)) [SIG Architecture, Instrumentation and Testing]
- Kubernetes is now built with go 1.21.7

* Remove obsolete vote link. PR [#1289](https://github.com/tiangolo/fastapi/pull/1289) by [@donhui](https://github.com/donhui).
* Allow disabling docs UIs by just disabling OpenAPI with `openapi_url=None`. New example in docs: [Advanced: Conditional OpenAPI](https://fastapi.tiangolo.com/advanced/conditional-openapi/). PR [#1421](https://github.com/tiangolo/fastapi/pull/1421).

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