You can configure Freshservice to send you an email alert whenever an asset's warranty (hardware) or the license (software) is nearing expiry.
To do this, go to Admin > Email notifications.
Click on the tab named CMDB.
Enable the required notification.
To configure the said notification, click on the respective link (Hardware Warranty Expiry Notification or Software License Expiry Notification) and make necessary changes to the email content. Add the person you want to notify in the to field (usually the person in the IT team in charge of expiring assets)