Declarative device management adds more capabilities to Apple's MDM protocol that can be used in addition to existing MDM protocol capabilities. Declarative device management allows managed devices to proactively and autonomously apply management settings and report state changes to the MDM server asynchronously. This results in less communication with the MDM server and faster, more reliable device updates.
Jamf Pro automatically enables declarative device management capabilities for compatible managed devices. Devices with declarative device management enabled report their state changes automatically to the MDM server via a communication channel called the status channel. Subscribed status items, when changed on the device, are proactively reported and reflected in device inventory information.
For more information on declarative device management and the status channel, see Intro to mobile device management profiles in Apple Platform Deployment.