Add ClusterVMPanicDetected runbook

docs/runbooks/ClusterVMPanicDetected.md

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+# ClusterVMPanicDetected
+
+## Meaning
+
+This alert fires when one or more VMs across the cluster have experienced
+non-recoverable guest OS panics in the last 24 hours. This may indicate a
+cluster-wide infrastructure issue such as a faulty node image, a broken
+driver, or a shared storage problem affecting VMs.
+
+The alert is based on the `kubevirt_vmi_guest_os_panic_total` metric, which
+tracks panic events detected via the pvpanic device (Linux and Windows) or
+the Hyper-V enlightenment mechanism (Windows).
+
+## Impact
+
+* One or more VMs are crashing across the cluster.
+* Applications running on affected VMs were unavailable during crashes.
+* If VMs have `RunStrategy: Always`, they restart automatically but may
+  continue crash-looping.
+* If multiple VMs are affected, the issue likely relates to shared
+  infrastructure rather than individual workloads.
+
+## Diagnosis
+
+1. **Identify all affected VMs** by querying the panic metric:
+
+   ```promql
+   sum by (namespace, name) (increase(kubevirt_vmi_guest_os_panic_total[24h])) > 0
+   ```
+
+2. **Look for common patterns** across affected VMs:
+
+   ```promql
+   kubevirt_vmi_guest_os_panic_total
+   ```
+
+   Check whether panics share the same `type` (e.g., all `pvpanic` or all
+   `hyper-v`) or the same `bugcheck_code`.
+
+3. **Check if affected VMs share a common node:**
+
+   ```bash
+   kubectl get vmi -A -o wide | grep -E "<vm-name-1>|<vm-name-2>|..."
+   ```
+
+   If all affected VMs run on the same node, the issue is likely
+   node-specific (hardware, kernel, driver).
+
+4. **Check node health and events:**
+
+   ```bash
+   kubectl describe node <node-name>
+   kubectl get events -A --field-selector involvedObject.kind=Node
+   ```
+
+5. **Review virt-launcher logs** for any of the affected VMs:
+
+   ```bash
+   POD=$(kubectl get pod -n <namespace> -l kubevirt.io/domain=<vm-name> -o name | head -n1)
+   kubectl logs $POD -n <namespace> -c compute --previous
+   ```
+
+## Mitigation
+
+* **Immediately:** Identify whether panics are concentrated on specific
+  nodes. If so, cordon the affected node(s) to prevent new VMs from
+  scheduling there.
+* **Short term:** Check for recent cluster-wide changes (node OS updates,
+  driver updates, storage changes) that coincide with the panics.
+* **Long term:** Investigate the root cause (faulty hardware, driver
+  incompatibility, storage issue) and apply fixes across the affected
+  infrastructure.
+
+<!--USstart-->
+If you cannot resolve the issue, see the following resources:
+
+- [OKD Help](https://www.okd.io/help/)
+- [#virtualization Slack channel](https://kubernetes.slack.com/channels/virtualization)
+<!--USend-->
+
+<!--DS: If you cannot resolve the issue, log in to the
+[Red Hat Customer Portal](https://access.redhat.com) and open a support case,
+attaching the artifacts gathered during the diagnosis procedure.-->