[Observium] using hardware sensors

Dear Observium community,

is there any description of using hardware sensors?

I've following issue. I'm operating a HP server with an Ilom under Ubuntu Linux. I configured in the device properties for ipmi: IPMI Hostname (IP address of the Ilom), IPMI Username (as configured at Ilom) IPMI Password, IPMI Userlevel (User) IPMI Interface (IPMI v2.0 RMCP+LAN Interface). Observium rekognized the sensors for temperature und fan speed. I did the same at an other HP server (same type) which is running ESXi 6.5 (HP customized Image). The Sensors are shown in the vSphre-Client and ESXi empeded host client UI. But for this host, Observium does not rekognize the sensors.

How can this be explained ?

Thanks.

Lg.

TF