I am having the same issue... it looks to me like the eventtypes are not working properly... under the servervirt:host eventtype it lists sourcetype=hypervisor:*:host as a filter, but in the HyperV app it lists search = sourcetype=microsoft:hyperv:host. I don't see where any sourcetype of hypervisor is created in the HyperV app, unless it is some kind of transform on the Servervirt app.
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