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+# HCOMisconfiguredDescheduler
+
+## Meaning
+
+A Descheduler is a Kubernetes application that causes the control plane to
+re-arrange the workloads in a better way.
+
+The descheduler uses the Kubernetes eviction API to evict pods, and receives
+feedback from `kube-api` whether the eviction request was granted or not.
+On the other side, in order to keep VM live and trigger live-migration,
+KubeVirt handles eviction requests in a custom way and unfortunately
+a live migration takes time.
+So from the descheduler's point of view, `virt-launcher` pods fail to be
+evicted, but they actually migrating to another node in background.
+So the way KubeVirt handles eviction requests causes the descheduler to
+make wrong decisions and take wrong actions that could destabilize the cluster.
+
+
+To correctly handle the special case of `VM` pod evicted triggering a live
+migration to another node, the `Kube Descheduler Operator` introduced
+a `profileCustomizations` named `devEnableEvictionsInBackground`
+which is currently considered an `alpha` feature
+on `Kube Descheduler Operator` side.
+
+## Impact
+
+Using the descheduler operator for KubeVirt VMs without the
+`devEnableEvictionsInBackground` profile customization can lead to
+unstable or oscillatory behavior, undermining cluster stability.
+
+## Diagnosis
+
+1. Check the CR for `Kube Descheduler Operator`:
+
+   ```bash
+   $ kubectl get -n openshift-kube-descheduler-operator KubeDescheduler cluster -o yaml
+   ```
+
+looking for:
+
+   ```yaml
+   spec:
+      profileCustomizations:
+         devEnableEvictionsInBackground: true
+   ```
+
+If not there, the `Kube Descheduler Operator` is not correctly configured
+to work alongside KubeVirt.
+
+## Mitigation
+
+Set:
+   ```yaml
+   spec:
+      profileCustomizations:
+         devEnableEvictionsInBackground: true
+   ```
+on the CR for the `Kube Descheduler Operator` or
+remove the `Kube Descheduler Operator`.
+
+Please notice that `EvictionsInBackground` is an alpha feature,
+and it's subject to change and currently provided as an
+experimental feature.
+
+<!--DS: If you cannot resolve the issue, log in to the
+link:https://access.redhat.com[Customer Portal] and open a support case,
+attaching the artifacts gathered during the diagnosis procedure.-->
+<!--USstart-->
+If you cannot resolve the issue, see the following resources:
+
+- [OKD Help](https://okd.io/docs/community/help)
+- [#virtualization Slack channel](https://kubernetes.slack.com/channels/virtualization)
+<!--USend-->