* update QEMU version to v2.9.1 ([#50597](https://github.com/kubernetes/kubernetes/pull/50597), [@dixudx](https://github.com/dixudx))
* controllers backoff better in face of quota denial ([#49142](https://github.com/kubernetes/kubernetes/pull/49142), [@joelsmith](https://github.com/joelsmith))

- 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:

* fix network setup in hack/local-up-cluster.sh (https://github.com/kubernetes/kubernetes/pull/60431) ([#60633](https://github.com/kubernetes/kubernetes/pull/60633), [@pohly](https://github.com/pohly))
    * better error diagnostics in hack/local-up-cluster.sh output
* Add prometheus cluster monitoring addon to kube-up ([#62195](https://github.com/kubernetes/kubernetes/pull/62195), [@serathius](https://github.com/serathius))

pkg encoding/xml, type UnmarshalerAttr interface, UnmarshalXMLAttr(Attr) error
pkg flag, type Getter interface { Get, Set, String }
pkg flag, type Getter interface, Get() interface{}
pkg flag, type Getter interface, Set(string) error
pkg flag, type Getter interface, String() string
pkg flag, var CommandLine *FlagSet
pkg go/ast, type SliceExpr struct, Max Expr

* Update gogo/protobuf to serialize backward, as to get better performance on deep objects. ([#77355](https://github.com/kubernetes/kubernetes/pull/77355), [@apelisse](https://github.com/apelisse))