Document how pod `observedGeneration` can be useful with InPlacePodVerticalScaling

[natasha41575]

In v1.33, we introduced status.observedGeneration and conditions[].observedGeneration fields in pods that tells you which podspec has been ack'd by the kubelet.

The primary motivation for this new field was in the context of in-place-pod-resize. With both IPPR and observedGeneration enabled:

• status.observedGeneration lets you know the latest resize request that has been ack'd by the kubelet
• conditions[].observedGeneration on the PodResizePending and PodResizeInProgress conditions lets you know which resize request is currently being reflected by that condition.

We should add this to the documentation on k/website, probably here: https://kubernetes.io/docs/tasks/configure-pod-container/resize-container-resources/.

/kind documentation
/triage accepted
/assign

[rishi-jat]

Hi! I'd like to work on this documentation issue. Please assign it to me if it’s available.