Which of the following is part of the Design KPIs related to troubleshooting?

The correct choice highlights a key area of focus within Design KPIs related to troubleshooting. Unreferenced Objects are items within the application that are no longer linked to any active component. Identifying unreferenced objects is crucial because they can lead to confusion, increased maintenance load, and potentially affect performance, all of which are significant troubleshooting concerns for developers.

By monitoring the presence of unreferenced objects, developers can streamline their applications, ensuring that all components are relevant and actively in use. This practice not only helps in maintaining clarity within the design but also aids in optimizing the application performance, making it an essential aspect of troubleshooting efficiency.

While Configuration Errors pertain to incorrect settings, User Feedback focuses on input from users about their experience, and Data Schema Issues deal with structural data problems, the identification of unreferenced objects is more directly aligned with a systematic approach to troubleshooting design elements within the application development lifecycle. Thus, emphasizing unreferenced objects as a Design KPI effectively fosters a cleaner and more efficient application architecture.