These are only available via the VMware API as far as I know, and is not gathered out of the box by NPM. Since its not available via SNMP, NPM's custom pollers cannot be used either. Best bet is Virtualization Manager. It is licensed by sockets and you can limit the polling to just the hosts you need using vmware roles and permissions. Any particular reason not to consider Virtualization Manager?
Thanks for your feedback Yet I think what you said it true.. Only reason not to go for Visualization Manager is the cost Anyway thanks once again