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Merge pull request #1277 from marquiz/docs/k8s-compat

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docs: describe supported Kubernetes versions
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docs/deployment/index.md
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@ -6,6 +6,9 @@ sort: 2
# Deployment
Node Feature Discovery can be deployed on any recent version of Kubernetes
(v1.21+).
See [Image variants](image-variants.md) for description of the different NFD
container images available.

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docs/get-started/introduction.md
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@ -18,7 +18,8 @@ sort: 1
This software enables node feature discovery for Kubernetes. It detects
hardware features available on each node in a Kubernetes cluster, and
advertises those features using node labels and optionally node extended
resources and node taints.
resources and node taints. Node Feature Discovery is compatible with any recent
version of Kubernetes (v1.21+).
NFD consists of four software components:

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docs/usage/nfd-topology-updater.md
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@ -36,8 +36,10 @@ given a configuration of resources to exclude via [`-excludeList`](../reference/
## Deployment Notes
Kubelet [PodResource API][podresource-api] is a prerequisite for
nfd-topology-updater to be able to run.
Kubelet [PodResource API][podresource-api] with the
[GetAllocatableResources][getallocatableresources] functionality enabled is a
prerequisite for nfd-topology-updater to be able to run (i.e. Kubernetes v1.21
or later is required).
Preceding Kubernetes v1.23, the `kubelet` must be started with
`--feature-gates=KubeletPodResourcesGetAllocatable=true`.
@ -83,3 +85,4 @@ for creating a configuration.
<!-- Links -->
[podresource-api]: https://kubernetes.io/docs/concepts/extend-kubernetes/compute-storage-net/device-plugins/#monitoring-device-plugin-resources
[feature-gate]: https://kubernetes.io/docs/reference/command-line-tools-reference/feature-gates
[getallocatableresources]: https://kubernetes.io/docs/concepts/extend-kubernetes/compute-storage-net/device-plugins/#grpc-endpoint-getallocatableresources