Tenant and Fabric Services use periodic discovery to detect out-of-sync configurations on the devices. Fabric and Tenant Services act on the published events and update the database to reflect the status of the devices as in-sync and out-of-sync.
You can perform on-demand device discovery using the command line.
The Asset Service periodically discovers devices in the Fabric at an interval that you can configure. The default is every hour, with valid values ranging from 15 minutes to 24 hours. You can use the efa inventory device discovery-time list command to view the current discovery interval for a device or for the Fabric. You can use the efa inventory device discovery-time update command to configure the discovery interval.