In today's rapidly evolving landscape of cloud-based and virtual environments, developers are seeking innovative ways to ensure the reliability and security of their applications. Traditional security reference architectures have relied on methods like SIEM and log analysis tools, but a new player is emerging - application performance monitoring (APM) data. APM data offers a unique approach to early security warnings, but collaboration between application and security teams is crucial to bridge the gap. APM tools hold a treasure trove of data that can benefit security professionals, providing visibility into external resource access, database query monitoring, anomaly detection, performance monitoring, and more. The integration of APM and application security (AppSec) not only optimizes application performance but also enhances security by detecting and preventing various types of threats, including SQL injections, cross-site scripting, denial-of-service attacks, malware infections, unauthorized access, data exfiltration, and code vulnerabilities. As APM tools continue to evolve and integrate with security practices, both developers and security teams will have a powerful ally in ensuring the performance, reliability, and security of their applications.