[Observium] Question about aggregated traffic graph for Dell DRAC

Hi, i have some Dell DRAC's added to observium, and i am seeing some strange things. The aggegrated graph from the overview page of the device gives an error "error Drawing graph". However the individual graphs per port are created just fine. the poller.php -d doesn't give any errors that i can see.

Another question is probably about all the metrics received from DRAC, i have a few OSses that have the Dell ISM (Integrated Service Module) installed. This allows the NIC's from the OS to be seen in the DRAC web interface. Would observium be able to read these ports as wel?

Tnx!

Steffie