In the current DNAC version, a Router is mandatory to see App health stats since we rely on Netflow for this information. There's work going on to support App stats exported from a WLC running in Local mode.
Use a ASR/ISR router with 16.6.x and above. Also add a description "lan" to the interface from which you want to export netflow. On DNAC select Maximum Telemetry for the router and netflow config with performance monitor context will be Automated .
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DNA also currently only installs the Automation module. In future, the installation screen will only provide one option (DNA) that will install both Automation and Assurance.