The Unsupported Stability Marker indicates that this project is no longer under active development. Importantly, this does not reflect on the code quality (and is not the same as deprecated). It merely means that there are no outstanding plans to issue another release, and no individuals are currently taking responsibility for maintenance duty.
An Unsupported project has the following characteristics:
Tip: Unsupported projects are often “looking for a new home”. If you are interested in continuing to push the project forward, you may wish to ask the owners whether they would be interested in help. If they are not, this may be an appropriate time to fork a project.