Missed that they where virtuals, do you have any credentials for these virtual servers ? You do need credentials to read the status. Could it be that these servers where added by some virtual server discovery ? If the yare discovered as virtual servers they either have some discovery of their own or they are added by a VM discovery when the virtualisation server was discovered and then it ran a datacollection job for these server(s). I only have experiance with ESX and there virtuals get discovered by runnen a datacollection on the ESX server. For that you need root like credentials that can read the ESX config.
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