* Fix a race condition in the scheduler preemption logic that could cause nominatedNodeName of a pod not to be considered in one or more scheduling cycles. ([#72504](https://github.com/kubernetes/kubernetes/pull/72504), [@bsalamat](https://github.com/bsalamat))

### Bug or Regression

- `client-go`, using log level 9, traces the following events of a HTTP request:
      - DNS lookup
      - TCP dialing
      - TLS handshake
      - Time to get a connection from the pool

### Bug or Regression

- Recording timing traces had a race condition. Impact in practice was probably low. ([#117139](https://github.com/kubernetes/kubernetes/pull/117139), [@pohly](https://github.com/pohly)) [SIG API Machinery, Architecture, Auth, CLI, Cloud Provider, Cluster Lifecycle, Instrumentation,...

* Fixed missing error checking that could cause kubelet to crash in a race condition. ([#60962](https://github.com/kubernetes/kubernetes/pull/60962), [@technicianted](https://github.com/technicianted))
* Bump Heapster to v1.5.2 ([#61396](https://github.com/kubernetes/kubernetes/pull/61396), [@kawych](https://github.com/kawych))

- Fixed a startup probe race condition that caused main containers to remain stuck in "Initializing" state when sidecar containers with startup probes failed initially but succeeded on restart in pods with restartPolicy=Never. ([#134801](https://github.com/kubernetes/kubernetes/pull/134801), [@yuanwang04](https://github.com/yuanwang04)) [SIG Node and Testing]

- Fixed a race condition in the kube-proxy initialization that could cause UDP traffic to service VIP. ([#126532](https://github.com/kubernetes/kubernetes/pull/126532), [@wedaly](https://github.com/wedaly))

     * The value is, e.g. http://localhost:9201 <br>
     * comment: <br>
     * The URL of the search engine HTTP endpoint.<br>
     * For IPv6 environments, use brackets around the IPv6 address (e.g., http://[::1]:9201)
     * @return The value of found property. (NotNull: if not found, exception but basically no way)
     */
    String getSearchEngineHttpUrl();

    /**