Antoine Dussault discusses the challenges of identifying the root causes of service reliability issues, such as latency and errors, highlighting the inefficiencies of traditional trial-and-error methods. He introduces Datadog's Tag Analysis as a solution that automatically identifies statistically significant tags correlated with performance issues, allowing users to quickly pinpoint and address root causes without the need for prior grouping guesses. The tool simplifies the investigation process by providing data-driven insights into latency or error spikes, helping users focus their efforts on relevant attributes and avoiding unnecessary trial-and-error. By showcasing examples where Tag Analysis identifies issues related to specific service versions or customer segments, Dussault emphasizes how this feature can prevent broader impacts and improve user experience. The Tag Analysis feature is available in preview, with further resources offered for those interested in exploring Datadog's application performance monitoring capabilities.