- The garbage collection controller no longer races with changes to ownerReferences when deleting orphaned objects. ([#132632](https://github.com/kubernetes/kubernetes/pull/132632), [@sdowell](https://github.com/sdowell)) [SIG API Machinery and Apps]

### Other (Cleanup or Flake)

    * faster handoff when a leader-elected process is gracefully terminated.
* Make volume binder resilient to races between main schedule loop and async binding operation  ([#72045](https://github.com/kubernetes/kubernetes/pull/72045), [@cofyc](https://github.com/cofyc))

- `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

* fluentd-gcp grace termination period increased to 60s. ([#65084](https://github.com/kubernetes/kubernetes/pull/65084), [@x13n](https://github.com/x13n))
* Pass cluster_location argument to Heapster ([#65176](https://github.com/kubernetes/kubernetes/pull/65176), [@kawych](https://github.com/kawych))

- Fixes regression in logging spurious stack traces when proxied connections are closed by the backend ([#82588](https://github.com/kubernetes/kubernetes/pull/82588), [@liggitt](https://github.com/liggitt))

* 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))

- 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,...

### Bug or Regression

- Fix data race in kube-scheduler when preemption races with a Pod update. ([#116439](https://github.com/kubernetes/kubernetes/pull/116439), [@alculquicondor](https://github.com/alculquicondor)) [SIG Scheduling]

- Trace output in apiserver logs is more organized and comprehensive. Traces are nested, and for all non-long running request endpoints, the entire filter chain is instrumented (e.g. authentication check is included). ([#88936](https://github.com/kubernetes/kubernetes/pull/88936), [@jpbet...

* 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))