* Cluster federation servers have changed the location in etcd where federated services are stored, so existing federated services must be deleted and recreated. Before upgrading, export all federated services from the federation server and delete the services. After upgrading the cluster, recreate the federated services from the exported data. ([#37770](https://github.com/kubernetes/kubernetes/pull/37770), [@enj](https://github.com/enj))...

Certificate management has become more robust in 1.15, with kubeadm now seamlessly rotating all your certificates (on upgrades) before they expire. Check the [kubeadm documentation](https://github.com/kubernetes/website/blob/dev-1.15/content/en/docs/reference/setup-tools/kubeadm/kubeadm-alpha.md) for information on how to manage your certificates.

([#69099](https://github.com/kubernetes/kubernetes/pull/69099), [@ehashman](https://github.com/ehashman))

## Deprecations

- kubectl
  - `kubectl convert` is deprecated and will be removed in v1.17.
  - The `--export` flag for the `kubectl get` command is deprecated and will be removed in v1.18. ([#73787](https://github.com/kubernetes/kubernetes/pull/73787), [@soltysh](https://github.com/soltysh))

- kubelet

All prior versions of docker will not be supported.

#### ThirdPartyResource

If you use ThirdPartyResource objects, they have moved from being namespaced-scoped to be cluster-scoped. Before upgrading to 1.3.0, export and delete any existing ThirdPartyResource objects using a 1.2.x client:

kubectl get thirdpartyresource --all-namespaces -o yaml > tprs.yaml
kubectl delete -f tprs.yaml

* Stackdriver cluster logging now deploys a new component to export Kubernetes events. ([#46700](https://github.com/kubernetes/kubernetes/pull/46700), [@crassirostris](https://github.com/crassirostris))

- go.opentelemetry.io/contrib/propagators: v0.20.0
- go.opentelemetry.io/contrib: v0.20.0
- go.opentelemetry.io/otel/exporters/otlp: v0.20.0
- go.opentelemetry.io/otel/oteltest: v0.20.0
- go.opentelemetry.io/otel/sdk/export/metric: v0.20.0
- go.opentelemetry.io/otel/sdk/metric: v0.20.0
- gonum.org/v1/gonum: v0.6.2
- gonum.org/v1/netlib: 7672324
- gonum.org/v1/plot: e2840ee
- modernc.org/cc: v1.0.0
- modernc.org/golex: v1.0.0