Monitoring VMware ESXi hardware

We have been using solarwinds virtualization manager for a and we are very happy with it! However....

We have recently noticed that it doesn't seem to detect/monitor hardware of the host.  We recently had a disk fail in a RAID group but didn't notice it for ages.  VMware knew that the disk was bad and we could see it though the Configure | Health Status but there was nothing in solarwinds.

Is this right?  Can this be fixed somehow?  Am I just doing something stupid?

Thanks

Bob