Within TrustFlight, Advisory defects can be used to highlight an aircraft issue which does not affect the serviceability of the aircraft, but should be logged. The defect is deferred permanently, and you can choose to have them hidden from your DDL/ADD also (please contact support@trustflight.io for this).
An Advisory defect can be added from both the iPad and the Web Dashboard. It is available when adding a defect by using "Deferral Options: Other" and "Rectification Category: Advisory Only".