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Syncline Links Session Replays Directly to Backend Traces via Shared Trace IDs

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Debugging a failed OTP delivery took an engineering team two days because their session replay tool and backend tracing tool operated independently, forcing manual timestamp matching across tabs. The core problem was that neither tool could see what the other recorded, leaving the root cause hidden in the gap between them. Syncline is a new observability tool that addresses this by embedding W3C traceparent IDs directly into the session replay stream at the exact frame each network request fires, linking frontend actions to backend spans without relying on clock synchronization. The browser SDK patches fetch and XHR to generate trace IDs, while the backend requires only a single OpenTelemetry environment variable pointing to Syncline's endpoint. The tool also inverts the standard sampling model, forcing sampled=1 whenever a session is being recorded so that critical bug replays are never left without corresponding backend spans.

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