Datadog has unveiled its Application Performance Monitoring (APM) platform to complement its existing infrastructure monitoring capabilities, providing full-stack observability. This integration allows users to monitor app performance and end-user satisfaction alongside their infrastructure metrics, with the ability to integrate with APM service provider New Relic for seamless visibility into app-level metrics. The new platform features Apdex score, a metric that estimates user satisfaction level on an application's response time, as well as Synthetics, which monitors app availability and load time. With Datadog's integration capabilities, users can easily correlate metrics and events between systems, collaborate with teams to resolve issues, and share insights across the organization. This solution is designed to help development and operations teams improve observability of all system components and their interactions, enabling them to identify and address performance problems more efficiently.