In older Version there was an undocumentet option to enable the Hardware Sensors inside the the VMWAre probe configuration, not sure that this work today also (and that I can publish it).
SNMPcollector probe you can use only if you had remoteboards from HP and newer one from Fujtsu, iRMC S4, used in production.
In additional you can use the CIM probe, but here I don´t had so muc experiance.
IPMI will also be a posibility if you use the ecoMeter Probe for Monitoring your DCIM stuff.
@David: per default ESXi Server use only CIM Provider to monitor the hardware. Technical it is not a problem to collect these sensors too with the probe (and for me it is a must have) as the systemedge AIM do it.
Alex