During openshift-cnv namespace deletion on 4.16.z, this problem is seen and I don't see any default alerts being raised  when this happen. Operator uninstallation is done from UI and then I tried removing openshift-cnv namespace

status:
  phase: Terminating
  conditions:
    - type: NamespaceDeletionDiscoveryFailure
      status: 'True'
      lastTransitionTime: '2024-12-02T14:44:16Z'
      reason: DiscoveryFailed
      message: 'Discovery failed for some groups, 3 failing: unable to retrieve the complete list of server APIs: subresources.kubevirt.io/v1: stale GroupVersion discovery: subresources.kubevirt.io/v1, subresources.kubevirt.io/v1alpha3: stale GroupVersion discovery: subresources.kubevirt.io/v1alpha3, upload.cdi.kubevirt.io/v1beta1: stale GroupVersion discovery: upload.cdi.kubevirt.io/v1beta1'

Environment : OCP-4.16.25
Trying to install CNV on 4.16 cluster(IBM)

all times when i tested on same environment

1.
2.
3.

Unable to delete namespace

Shouldn't see this problem 

kind: Project
apiVersion: project.openshift.io/v1
metadata:
  name: openshift-cnv
  uid: 521f8f80-ee75-4d1b-a28f-c6bc7da46df0
  resourceVersion: '1600516'
  creationTimestamp: '2024-12-02T14:20:06Z'
  deletionTimestamp: '2024-12-02T14:44:08Z'
  labels:
    kubernetes.io/metadata.name: openshift-cnv
    olm.operatorgroup.uid/a4838ddc-fd72-47c5-a388-8ffbb62789c7: ''
    openshift.io/cluster-monitoring: 'true'
    pod-security.kubernetes.io/audit: privileged
    pod-security.kubernetes.io/audit-version: v1.24
    pod-security.kubernetes.io/warn: privileged
    pod-security.kubernetes.io/warn-version: v1.24
    security.openshift.io/scc.podSecurityLabelSync: 'true'
  annotations:
    openshift.io/node-selector: ''
    openshift.io/sa.scc.mcs: 's0:c27,c9'
    openshift.io/sa.scc.supplemental-groups: 1000720000/10000
    openshift.io/sa.scc.uid-range: 1000720000/10000
  managedFields:
    - manager: pod-security-admission-label-synchronization-controller
.......................
spec:
  finalizers:
    - kubernetes
status:
  phase: Terminating
  conditions:
    - type: NamespaceDeletionDiscoveryFailure
      status: 'True'
      lastTransitionTime: '2024-12-02T14:44:16Z'
      reason: DiscoveryFailed
      message: 'Discovery failed for some groups, 3 failing: unable to retrieve the complete list of server APIs: subresources.kubevirt.io/v1: stale GroupVersion discovery: subresources.kubevirt.io/v1, subresources.kubevirt.io/v1alpha3: stale GroupVersion discovery: subresources.kubevirt.io/v1alpha3, upload.cdi.kubevirt.io/v1beta1: stale GroupVersion discovery: upload.cdi.kubevirt.io/v1beta1'
    - type: NamespaceDeletionGroupVersionParsingFailure
      status: 'False'
      lastTransitionTime: '2024-12-02T14:44:17Z'
      reason: ParsedGroupVersions
      message: All legacy kube types successfully parsed
    - type: NamespaceDeletionContentFailure
      status: 'True'
      lastTransitionTime: '2024-12-02T14:44:17Z'
      reason: ContentDeletionFailed
      message: 'Failed to delete all resource types, 1 remaining: Internal error occurred: failed calling webhook "kubevirt-validator.kubevirt.io": failed to call webhook: Post "https://kubevirt-operator-webhook.openshift-cnv.svc:443/kubevirt-validate-delete?timeout=10s": service "kubevirt-operator-webhook" not found'
    - type: NamespaceContentRemaining
      status: 'True'
      lastTransitionTime: '2024-12-02T14:44:17Z'
      reason: SomeResourcesRemain
      message: 'Some resources are remaining: hyperconvergeds.hco.kubevirt.io has 1 resource instances, ssps.ssp.kubevirt.io has 1 resource instances'
    - type: NamespaceFinalizersRemaining
      status: 'True'
      lastTransitionTime: '2024-12-02T14:44:17Z'
      reason: SomeFinalizersRemain
      message: 'Some content in the namespace has finalizers remaining: kubevirt.io/hyperconverged in 1 resource instances, ssp.kubevirt.io/finalizer in 1 resource instances'


$ oc describe ns openshift-cnv
Name:         openshift-cnv
Labels:       kubernetes.io/metadata.name=openshift-cnv
              olm.operatorgroup.uid/a4838ddc-fd72-47c5-a388-8ffbb62789c7=
              openshift.io/cluster-monitoring=true
              pod-security.kubernetes.io/audit=privileged
              pod-security.kubernetes.io/audit-version=v1.24
              pod-security.kubernetes.io/warn=privileged
              pod-security.kubernetes.io/warn-version=v1.24
              security.openshift.io/scc.podSecurityLabelSync=true
Annotations:  openshift.io/node-selector: 
              openshift.io/sa.scc.mcs: s0:c27,c9
              openshift.io/sa.scc.supplemental-groups: 1000720000/10000
              openshift.io/sa.scc.uid-range: 1000720000/10000
Status:       Terminating
Conditions:
  Type                                         Status  LastTransitionTime               Reason                 Message
  ----                                         ------  ------------------               ------                 -------
  NamespaceDeletionDiscoveryFailure            True    Mon, 02 Dec 2024 09:44:16 -0500  DiscoveryFailed        Discovery failed for some groups, 3 failing: unable to retrieve the complete list of server APIs: subresources.kubevirt.io/v1: stale GroupVersion discovery: subresources.kubevirt.io/v1, subresources.kubevirt.io/v1alpha3: stale GroupVersion discovery: subresources.kubevirt.io/v1alpha3, upload.cdi.kubevirt.io/v1beta1: stale GroupVersion discovery: upload.cdi.kubevirt.io/v1beta1
  NamespaceDeletionGroupVersionParsingFailure  False   Mon, 02 Dec 2024 09:44:17 -0500  ParsedGroupVersions    All legacy kube types successfully parsed
  NamespaceDeletionContentFailure              True    Mon, 02 Dec 2024 09:44:17 -0500  ContentDeletionFailed  Failed to delete all resource types, 1 remaining: Internal error occurred: failed calling webhook "kubevirt-validator.kubevirt.io": failed to call webhook: Post "https://kubevirt-operator-webhook.openshift-cnv.svc:443/kubevirt-validate-delete?timeout=10s": service "kubevirt-operator-webhook" not found
  NamespaceContentRemaining                    True    Mon, 02 Dec 2024 09:44:17 -0500  SomeResourcesRemain    Some resources are remaining: hyperconvergeds.hco.kubevirt.io has 1 resource instances, ssps.ssp.kubevirt.io has 1 resource instances
  NamespaceFinalizersRemaining                 True    Mon, 02 Dec 2024 09:44:17 -0500  SomeFinalizersRemain   Some content in the namespace has finalizers remaining: kubevirt.io/hyperconverged in 1 resource instances, ssp.kubevirt.io/finalizer in 1 resource instances