As of July 11th, V2 Schema 1 image manifests will no longer be supported for image pulls. There are a number of images from the samples operator using older manifests which is causing alerts on clusters.
https://access.redhat.com/articles/6138332
Labels
alertname = SamplesImagestreamImportFailing
prometheus = openshift-monitoring/k8s
severity = warning
Annotations
message = Samples operator is detecting problems with imagestream image imports. You can look at the "openshift-samples" ClusterOperator object for details. Most likely there are issues with the external image registry hosting the images that needs to be investigated. Or you can consider marking samples operator Removed if you do not care about having sample imagestreams available. The list of ImageStreams for which

time="2022-07-11T16:58:01Z" level=warning msg="Image import for imagestream redhat-openjdk18-openshift tag 1.0 generation 175 failed with detailed message Internal error occurred: registry.redhat.io/redhat-openjdk-18/openjdk18-openshift:1.0: unsupported: V2 schema 1 manifest digests are no longer supported for image pulls. Use the equivalent V2 schema 2 manifest digest instead. For more information see
https://access.redhat.com/articles/6138332
"
time="2022-07-11T16:58:02Z" level=info msg="initiated an imagestreamimport retry for imagestream/tag redhat-openjdk18-openshift/1.0"

Version-Release number of selected component (if applicable):
4.x

How reproducible:
Since July 11th.

Steps to Reproduce:
1. Observe a cluster since the change occurred.
2.
3.

Actual results:
SamplesImagestreamImportFailing and import issues for the impacted images.

Expected results:
We should remove these extremely old images.

Additional info: