Would be great if you could add new field for Warranty start for all nodes where you use automated warranty check ( DELL, IBM, HP ) .
This feature would greatly help to report not only on expiring warranty but also on age of the servers
I think that's the intention of the installation date and purchase date fields, though I don't disagree with adding this field for the simple fact that some may use this field for recurring maintenance/support contracts and will tell the user whether the contract is a 1yr, 2yr, etc contract.