A scheduled report alert sounds like what you are after. You can use it with a report like "Windows: Servers less than 10% free disk space" or a modified version of it which suits your needs. You can create a schedule (which can be as often as you would like) to send you the report alert as soon as it contains data.
If you are scanning specific assets often, say every 10 minutes, you can create a schedule which will send the report every 10 minutes. However, the report will only be sent once it contains data, meaning when an asset has less than 10% disk space. More information about the report alerts can be found in this knowledgebase article: https://www.lansweeper.com/kb/113/sending-email-alerts.html