I tried but with no lucky.
I take a look on the vmware probe configuration on the monitor and it display the cluster configuration as :
Resources:
<Host IP >.Cluster
Key:
"ESC:HOST:<Vcenter IP>:4c4c4544-0036-3010-8030-c8c04f4d3232"."Cluster"
but looking on the cm_configuration_item table a cant find the cluster resouce