API to monitor cluster upgrade status

1. Proposed title of this feature request

API to monitor cluster upgrade status

2. What is the nature and description of the request?

We are looking for all useful information that oc get clusterversion -o yaml provided related to cluster upgrade. Below are some examples. But development team would know much better what all they can expose that is useful to track cluster upgrade status.

• lastTransitionTime: "2023-10-25T15:01:30Z"
        message: 'Working towards 4.12.30: 245 of 831 done (29% complete), waiting on
          control-plane-machine-set'
        reason: ClusterOperatorUpdating
        status: "True"
        type: Progressing
  history:
      - startedTime: "2023-10-25T15:01:30Z"
        state: Completed
        verified: true
        version: 4.12.30

• lastTransitionTime: "2023-10-25T06:55:42Z"
        message: 'Retrieving payload failed version="4.12.30" image="ocp.251.mirror.mavdallas.com:8443/openshift/release-images@sha256:86ee723d4dc2a83f836232d1d03f8b4193940c50a2636ee86924acb5d14b0b64"
          failure=The update cannot be verified: unable to verify sha256:86ee723d4dc2a83f836232d1d03f8b4193940c50a2636ee86924acb5d14b0b64
          against keyrings: verifier-public-key-redhat'
        reason: RetrievePayload
        status: "False"
        type: ReleaseAccepted

PS: customer either look for list of possible return values or RFE to provide API that would return for 'upgrade status' something like '245 of 831 done (29% complete)'

3. Why does the customer need this? (List the business requirements here)

to better monitor cluster upgrade process (as it can get stuck without warning)

4. List any affected packages or components.