- Fixes a bug of identifying the correct containerd process. ([#97888](https://github.com/kubernetes/kubernetes/pull/97888), [@pacoxu](https://github.com/pacoxu))
- Fixes add-on manager leader election to use leases instead of endpoints, similar to what kube-controller-manager does in 1.20 ([#98968](https://github.com/kubernetes/kubernetes/pull/98968), [@liggitt](https://github.com/liggitt))

* Migrate controller-manager and scheduler to EndpointsLeases leader election. ([#84084](https://github.com/kubernetes/kubernetes/pull/84084), [@wojtek-t](https://github.com/wojtek-t))

* Scheduling conformance tests related to daemonsets should set the annotation that relaxes node selection restrictions, if any are set. This ensures conformance tests can run on a wider array of clusters. ([#68793](https://github.com/kubernetes/kubernetes/pull/68793), [@aveshagarwal](https://github.com/aveshagarwal))

  
  - make kube::util::find-binary not dependent on bazel-out/ structure
  
    Implement an aspect that outputs go_build_mode metadata for go binaries,
    and use that during binary selection. ([#94449](https://github.com/kubernetes/kubernetes/pull/94449), [@justaugustus](https://github.com/justaugustus)) [SIG Architecture, CLI, Cluster Lifecycle, Node, Release and Testing]
- Kubernetes is now built using go1.15.5

   ([#123281](https://github.com/kubernetes/kubernetes/pull/123281), [@seans3](https://github.com/seans3))

* kube-addon-manager has been updated to v9.0.2 to fix a bug in leader election (https://github.com/kubernetes/kubernetes/pull/80575) ([#80861](https://github.com/kubernetes/kubernetes/pull/80861), [@mborsz](https://github.com/mborsz))