☂️-Issue for "Support for Kubernetes v1.20”

[rfranzke]

/area open-source
/kind enhancement
/priority normal
/topology garden seed shoot

Kubernetes v1.20 will be released soon, find the changelog here: https://github.com/kubernetes/kubernetes/blob/master/CHANGELOG/CHANGELOG-1.20.md

Work has been started and is pushed to the kubernetes-v1.20 branch. There should be similar branches in the provider extension repositories in case the work has been started already.

Identified TODOs so far:

	Status
✅	completed
☑️	partly completed
🚧	in progress
❔	to be clarified
ℹ️	interesting, but not relevant (yet)
⏸	won't fix
🚩	postponed
❌	incomplete

---

gardener/gardener ➡️ #3296

• ✅ Allow instantiating v1.20 Kubernetes clients
• ✅ Add v1.20 to supported Kubernetes versions in the documentation
• ✅ Build new gardener/hyperkube images for v1.20
• ✅ Check whether the CRDs have preserveUnknownFields=false if possible, see Show error in status if preserve unknown fields is true for nonstructural schemas kubernetes/kubernetes#93078
• ✅ Adapt egress selector configuration for KonnectivityTunnel feature gate, see apiserver: support 'controlplane' as an egress selector type kubernetes/kubernetes#95235
• ℹ️ Disable watch caches for events, see Disable watchcache for events kubernetes/kubernetes#96052
• ✅ Replace node-role.kubernetes.io/master with node-role.kubernetes.io/control-plane, see kubeadm: deprecate the "node-role.kubernetes.io/master" label / taint kubernetes/kubernetes#95382
• ℹ️ Replace failure-domain.beta.kubernetes.io/{zone,region} with topology.kubernetes.io/{zone,region}, see Use topology labels instead of old beta names kubernetes/kubernetes#96033
• ✅ kube-controller-manager uses Lease for its leader election

gardener/gardener-extension-provider-alicloud ➡️ #204

• ✅ Revendor gardener/gardener to allow instantiation of 1.20 Kubernetes client

gardener/gardener-extension-provider-aws ➡️ #237

• ✅ Revendor gardener/gardener to allow instantiation of 1.20 Kubernetes client
• ✅ Revendor gardener/cloud-provider-aws with v1.20.0 sources

gardener/gardener-extension-provider-azure ➡️ #228

• ✅ Revendor gardener/gardener to allow instantiation of 1.20 Kubernetes client
• ✅ Revendor gardener/cloud-provider-azure with v1.20.0 sources
• ℹ️ Azure blob disk feature (kind: Shared/Dedicated) has been deprecated, see doc: deprecate azure blob disk feature kubernetes/kubernetes#92905
• ✅ Postpone Azure CSI migration to 1.21, see Adopt CSI for Azure extension beginning with Kubernetes 1.21 gardener-extension-provider-azure#3 (Result: Postpone CSI migration to Kubernetes v1.21 gardener-extension-provider-azure#215)

gardener/gardener-extension-provider-gcp ➡️ #219

• ✅ Revendor gardener/gardener to allow instantiation of 1.20 Kubernetes client
• ✅ Revendor gardener/cloud-provider-gcp with v1.20.0 sources

gardener/gardener-extension-provider-openstack ➡️ #192

• ✅ Revendor gardener/gardener to allow instantiation of 1.20 Kubernetes client
• 🚩 Use latest version of OpenStack cloud-controller-manager (postponed until v1.20 version gets released; in the meantime we continue to use the current versions until Update to cloud-provider-openstack version 1.20 gardener-extension-provider-openstack#148 is tackled)

gardener/gardener-extension-provider-packet ➡️ #96

• ✅ Revendor gardener/gardener to allow instantiation of 1.20 Kubernetes client

gardener/gardener-extension-provider-vsphere ➡️ #118

• ✅ Revendor gardener/gardener to allow instantiation of 1.20 Kubernetes client

[timuthy]

Disable watch caches for events, see kubernetes/kubernetes#96052

As investigated, watch cache for events.v1 was already disabled and every new release from >= 1.17 will disable the cache also for events.events.k8s.io. I don't see an action item from our side, i.e. let's move it to ℹ️?

[rfranzke]

/cc @dguendisch @schrodit FYI :) Please prepare the execution and publishing of the conformance tests for 1.20

[rfranzke]

/close as all related pull requests were merged