- build: Use go-runner:buster-v2.0.1 (built using go1.15.1)
  - bazel: Replace --features with Starlark build settings flag
  - hack/lib/util.sh: some bash cleanups
    
    - switched one spot to use kube::logging
    - make kube::util::find-binary return an error when it doesn't find
      anything so that hack scripts fail fast instead of with "binary not
      found errors".

* YAMLDecoder Read now returns the number of bytes read ([#57000](https://github.com/kubernetes/kubernetes/pull/57000), [@sel](https://github.com/sel))

* Drop hacks used for Mesos integration that was already removed from main kubernetes repository ([#56754](https://github.com/kubernetes/kubernetes/pull/56754), [@dims](https://github.com/dims))

* Adds AllowPrivilegeEscalation to control whether a process can gain more privileges than its parent process ([#47019](https://github.com/kubernetes/kubernetes/pull/47019), [@jessfraz](https://github.com/jessfraz))

* 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

- Integration testing now takes periodic Prometheus scrapes from the etcd server.

* kubeadm: remove deprecated kubeadm config print-defaults command ([#71467](https://github.com/kubernetes/kubernetes/pull/71467), [@rosti](https://github.com/rosti))

* Adding vishh as an reviewer/approver for hack directory ([#54007](https://github.com/kubernetes/kubernetes/pull/54007), [@vishh](https://github.com/vishh))

* kubeadm: `kubeadm reset` won't drain and remove the current node anymore ([#42713](https://github.com/kubernetes/kubernetes/pull/42713), [@luxas](https://github.com/luxas))
* hack/godep-restore.sh: use godep v79 which works ([#42965](https://github.com/kubernetes/kubernetes/pull/42965), [@sttts](https://github.com/sttts))

    * PR [#1862](https://github.com/tiangolo/fastapi/pull/1862).
* In `encoders.jsonable_encoder` remove parameter `sqlalchemy_safe`.
    * It was an early hack to allow returning SQLAlchemy models, but it was never documented, and the recommended way is using Pydantic's `orm_mode` as described in the tutorial: [SQL (Relational) Databases](https://fastapi.tiangolo.com/tutorial/sql-databases/).