Document CSI node ID annotations

[carlory]

Summary

• Documents csi.alpha.kubernetes.io/node-id annotation used on VolumeAttachments for finding node identifiers when CSINode object is unavailable
• Documents csi.volume.kubernetes.io/nodeid deprecated annotation previously used on Nodes

related to kubernetes/kubernetes#135676

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[carlory]

/cc @lmktfy@jsafrane

[carlory]

/hold
util kubernetes/kubernetes#135676 is merged

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[lmktfy]

It's actually OK to mark both of these deprecated right away, because the paradigm of putting "alpha" or "beta" in the key is deprecated, and any label or annotation using the old way can be marked deprecated on those grounds.

Also we can mark things deprecated even if we don't have a plan to migrate to a different key.

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The text should briefly explain the situation to readers though; they might wonder what persistent storage to use if non-CSI is deprecated and CSI depends on using a deprecated annotation.

I think this is fine though; various important subparts of Kubernetes were technically in alpha at the 1.0 release and were still alpha come (eg) v1.17, and the world Did Not End.

[carlory]

It's actually OK to mark both of these deprecated right away

@lmktfy we can not deprecated the csi.alpha.kubernetes.io/node-id annotation because the external attacher still uses it.
See kubernetes-csi/external-attacher#83 and https://github.com/kubernetes-csi/external-attacher/blob/master/pkg/controller/csi_handler.go#L755-L784

/cc @jsafrane
for double check.

[carlory]

The text should briefly explain the situation to readers though; they might wonder what persistent storage to use if non-CSI is deprecated and CSI depends on using a deprecated annotation.

updated.