Feature flag tracking is a new capability in Datadog RUM that enriches browser and mobile RUM data with feature flag tags, providing visibility into application performance and user experience. This allows teams to release new features safely and reliably by testing their impact on users and easily rolling back if issues arise. With feature flag tracking, teams can identify problematic features during incident investigation, check the impact of newly released features, and monitor releases for user satisfaction. The capability provides out-of-the-box analysis and metrics, such as loading times and error rates by variant, to help pinpoint issues and ensure safe releases.