Threat modeling is essential for creating secure systems, involving system modeling and threat elicitation to address security and privacy concerns. Challenges in developing effective threat models include limited visibility into system development, discrepancies between design and implementation, and data flow blind spots. Datadog's App and API Protection (AAP) tool addresses these challenges by providing comprehensive system mapping and real-time network data through distributed tracing with Datadog APM, enabling organizations to visualize complex infrastructures and anticipate potential threats. AAP facilitates threat modeling by identifying system components and dependencies, pinpointing service ownership for efficient communication, and generating security signals for detected vulnerabilities. This iterative process helps organizations adapt to evolving systems and threats, ensuring their threat models remain accurate and actionable.