The documentation
https://docs.redhat.com/en/documentation/openshift_container_platform/4.18/html/virtualization/monitoring#virt-promql-vcpu-metrics_virt-prometheus-queries

Should get a paragraph for the kubevirt_vmi_vcpu_delay_seconds_total metric.

Example query: irate(kubevirt_vmi_vcpu_delay_seconds_total[5m]) > 0.05

Description of the metric: Time the vCPU was enqueued by the host scheduler, but was waiting in the queue instead of running. Exposed to the VM as a steal time.

You may also need to add a release note