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Resolution: Done
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In a 4.18.19 (the one that will ship https://issues.redhat.com/browse/OCPBUGS-56251), CMO will block cluster upgrades if the configurations in openshift-monitoring/cluster-monitoring-config or openshift-user-workload-monitoring/user-workload-monitoring-config contains Alertmanager apiVersion:v1 .This is to prompt users to clean up their configurations by removing unsupported fields. The goal is to prevent CMO from becoming degraded (and unavailable) during the upgrade to version 4.19
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MON-4093 Set 4.17.z as the minor min for upgrades to 4.18
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