Server is not discovered as a guest VM and no Virtualized by relationships are createdDescriptionDiscovery is run on a guest VM however no "Virtualized by::Virtualizes" relation is created between the guest VM and the associated hypervisor. The "is Virtual" (virtual) field is set to false, meaning that the host is a physical server instead of a guest VM.Release or EnvironmentAllCauseThere are many scenarios where this would happen depending on the virtualization type, Discovery method used and instance configuration. The best source to find the possible root cause is to look at the "Virtual Computer Check" Business rule and inspect the script to follow the code. Below are some possible scenarios: The Business Rule "Virtual Computer Check" has been customized or disabled;serial_number field is empty or not returning the expected value for a guest VM;correlation_id field not matchingResolutionCheck if the Business Rule "Virtual Computer Check" has been customized or disabled;Check if the serial_number field is empty or is not returning the expected value for a guest VM. For example for VMWare, the serial_number should be in the format VMware-<correlation_id>, this correlation_id should be the same for the related record in cmdb_ci_vmware_instance