Artifactory writes several entries from the Debian package's metadata as properties on all of the artifacts (based on the control file's content).
These properties can be used to search for Debian packages more efficiently using Arifactory's Package Search.
Metadata properties are written for each new Artifact that is deployed to Artifactory.
To have these properties written to Debian artifacts that already exist in your repositories you need to call the Calculate Debian Repository Metadata REST API which writes the properties to all of the artifacts by default.