* Add direct serializer ([#26251](https://github.com/kubernetes/kubernetes/pull/26251), [@caesarxuchao](https://github.com/caesarxuchao))
* Add a NodeCondition "NetworkUnavailable" to prevent scheduling onto a node until the routes have been created  ([#26415](https://github.com/kubernetes/kubernetes/pull/26415), [@wojtek-t](https://github.com/wojtek-t))

* bootstrap: Start hostNetwork pods even if network plugin not ready ([#33347](https://github.com/kubernetes/kubernetes/pull/33347), [@justinsb](https://github.com/justinsb))
* Factor out post-init swagger and OpenAPI routes ([#32590](https://github.com/kubernetes/kubernetes/pull/32590), [@sttts](https://github.com/sttts))

    assertFailsWith<InterruptedIOException> {
      // If this succeeds, too many requests were made.
      client.newCall(request).execute()
    }
  }

  /**
   * Make a request with two routes. The first route will time out because it's connecting to a
   * special address that never connects. The automatic retry will succeed.
   */
  @Test
  fun connectTimeoutsAttemptsAlternateRoute() {

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  Expand the histogram range to 0-10s for all `apiserver_admission_*_duration_seconds` metrics. ([#101208](https://github.com/kubernetes/kubernetes/pull/101208), [@voutcn](https://github.com/voutcn))

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* vSphere kube-up: Wait for cbr0 configuration to complete before setting up routes. ([#35232](https://github.com/kubernetes/kubernetes/pull/35232), [@kerneltime](https://github.com/kerneltime))

  * Clean up blackhole routes when using kubenet ([#47572](https://github.com/kubernetes/kubernetes/pull/47572), [@justinsb](https://github.com/justinsb))

  The bug could result in the PDB synchronization updates firing too often or the pod disruption cleanups taking too long to happen. ([#114770](https://github.com/kubernetes/kubernetes/pull/114770), [@mimowo](https://github.com/mimowo)) [SIG Apps]

- Fix route conflicted operations when updating multiple routes together ([#88209](https://github.com/kubernetes/kubernetes/pull/88209), [@feiskyer](https://github.com/feiskyer)) [SIG Cloud Provider]