Sensor shows the state of the ESXi server (6.7), and the sensor status are Warning with following message: Unknown. 327 elements return a unknown state: CPU2 Level-3 Cache; CPU2 Level-2 Cache; CPU2 Level-1 Cache; CPU1 Level-3 Cache; CPU1 Level-2 Cache; CPU1 Level-1 Cache; Intel Corporation Sky Lake-E PCI Express Root Port A
From our experience, these warnings are transmitted by the CIM services from the target device. Mostly, the reason is that the CIM service does not receive information from the drivers. Some updates of the vCenter change the internal way how the vendor specific drivers (Dell, HP...) communicate with the vCenter via CIM.
In your case, please change the setting from Show unknown states to Do not show unknown states if you do not want to have an Unknown status for warnings.
That means that Unknown states should be ignored if you enable the option. Only "real" errors would be displayed.
Also, try restarting the CIM service on the ESXi host to see if that clears the Unknown status items. You can check in the Host-Monitor section of the VM Console on the Hardware tab then System Sensors to see the current status and whether the restart resolves them. The Health column is the status reported via the PRTG ESXi Host Hardware sensor.
Disclaimer:
The information in the Paessler Knowledge Base comes without warranty of any kind. Use at your own risk. Before applying any instructions please exercise proper system administrator housekeeping. You must make sure that a proper backup of all your data is available.
