impact `availableUpdates: null` results in run-time error on Cluster Settings page

This Jira is only contains impact assessment for OCPBUGS-6053 (for 4.13) and OCPBUGS-6678 (for 4.12.z). Check the bug for more details.

Which 4.y.z to 4.y'.z' updates increase vulnerability?

Answer:

• All updates to 4.12.1 and  4.13.0-ec.2.

Which types of clusters are impacted?

Answer:

• Clusters with a channel set, who might, after arriving on a vulnerable release, have availableUpdates null and Upgradeable=False.
• Clusters are not  vulnerable if availableUpdates is populated, regardless of whether the values it contains came from conditionally-recommended updates.

What is the impact? Is it serious enough to warrant removing update recommendations?

Answer:

•    The /settings/cluster page in the web-console fails to render.

How involved is remediation?

Answer:

•  The /settings/cluster page recovers once there are availableUpdates or Upgradeable becomes True or both.
• For upgrading the cluster use  

  $ oc adm upgrade

   Refer https://docs.openshift.com/container-platform/4.12/updating/updating-cluster-cli.html for steps around how to upgrade cluster using oc.

• You can also use  OC CLI to monitor the cluster. For example you can also use OC CLI to describe ClusterVersion status i.e.

   $ oc get clusterversion -o yaml or oc get clusterversion -o json

Is this a regression?

Answer:

• Yes, the regression entered 4.13.0-ec.2 via OCPBUGS-4700 and 4.12.1 via OCPBUGS-5263.