* Fix incorrect retry logic in scheduler ([#50106](https://github.com/kubernetes/kubernetes/pull/50106), [@julia-stripe](https://github.com/julia-stripe))

* Fix incorrect retry logic in scheduler ([#50106](https://github.com/kubernetes/kubernetes/pull/50106), [@julia-stripe](https://github.com/julia-stripe))
* Enforce explicit references to API group client interfaces in clientsets to avoid ambiguity. ([#49370](https://github.com/kubernetes/kubernetes/pull/49370), [@sttts](https://github.com/sttts))

- 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:

<code>int</code>; for arrays or constant strings, constant indices must also be in range.
If both indices are constant, they must satisfy <code>low &lt;= high</code>.
If the indices are out of range at run time, a <a href="#Run_time_panics">run-time panic</a> occurs.
</p>

<p>
Except for <a href="#Constants">untyped strings</a>, if the sliced operand is a string or slice,

    - [RBAC](#rbac-1)
    - [Scheduling](#scheduling-1)
    - [Service Catalog](#service-catalog)
    - [Volumes](#volumes-1)
  - [Deprecations](#deprecations)
    - [Cluster Provisioning Scripts](#cluster-provisioning-scripts)
    - [kubeadm](#kubeadm-1)
    - [Other Deprecations](#other-deprecations)
  - [Changes to API Resources](#changes-to-api-resources)
    - [ABAC](#abac)
    - [Admission Control](#admission-control)

* Validate that cronjob names are 52 characters or less ([#52733](https://github.com/kubernetes/kubernetes/pull/52733), [@julia-stripe](https://github.com/julia-stripe))
* add readme file of ipvs ([#51937](https://github.com/kubernetes/kubernetes/pull/51937), [@Lion-Wei](https://github.com/Lion-Wei))



# v1.9.0-alpha.1

- Fixed a bug where CEL expressions in CRD validation rules would incorrectly compute a high estimated cost for functions that return strings, lists or maps.

- Updated defaultbackend image to 1.5. Users should concentrate on updating scripts to the new version. ([#69120](https://github.com/kubernetes/kubernetes/pull/69120), [@aledbf](https://github.com/aledbf))

- Integration testing now takes periodic Prometheus scrapes from the etcd server.
  There is a new script ,`hack/run-prometheus-on-etcd-scrapes.sh`, that runs a containerized Prometheus server against an archive of such scrapes. ([#106190](https://github.com/kubernetes/kubernetes/pull/106190), [@MikeSpreitzer](https://github.com/MikeSpreitzer)) [SIG API Machinery and Testing]

- The `generate_groups.sh` and `generate_internal_groups.sh` scripts from the `k8s.io/code-generator` repo are deprecated (but still work) in favor of `kube_codegen.sh` in that same repo.  Projects which use the old scripts are encouraged to look at adopting the new one. ([#117897](https://github.com/kubernetes/kubernetes/pull/117897), [@thockin](https://github.com/thockin)) [SIG API Machinery]...