Datadog's unified service tagging provides a standardized configuration for adding key identifiers to applications, allowing teams to monitor their entire system at a high level, drill down to individual services, and easily correlate data across application components. This feature alleviates the pain of inconsistent tag schema implementation by reserving three standard tags (`env`, `service`, and `version`) that automatically connect different data types in Datadog, providing a single source of truth for monitoring data streaming from applications. By applying these standardized tags to services, teams can easily create consistent points of reference for monitoring application performance in one place, pivot between infrastructure metrics, logs, and traces, and identify problematic releases with the version tag. Additionally, unified service tagging enables developers to configure telemetry independently from other teams, making it easier to monitor performance without relying on manual configuration or external tools.