Arnaud Minier worked on the DataDog/dd-sdk-ios repository, focusing on refactoring and consolidating tracing metrics within the iOS SDK. He relocated the _dd.agent_psr metric from the root of spans into the metrics map, updating both the encoding logic and associated tests to align with this new structure. By removing non-allowed root-level _dd handling in the SpanMatcher, Arnaud simplified the metrics ingestion path and reduced potential edge-case failures. His work, implemented in Swift and leveraging the Datadog SDK, improved the reliability and maintainability of trace data processing, reflecting a thoughtful approach to mobile development and codebase consistency.