問題文
A platform team runs a payment service that calls three downstream services. Customers report that some checkout requests are slow, but the average latency dashboard looks healthy. Which OpenTelemetry signal is designed to show where the time went inside one individual slow request?
選択肢
- Metrics, because aggregated statistics can be broken down until a single request becomes visible in the time series.
- Logs, because every log line already carries the full call graph of the request that produced the line.
- Baggage, because it travels with the request across services and accumulates the timing of each hop it passes.
- Traces, because a trace records the path of a single request as a tree of spans.