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识别链路追踪中的瓶颈Span

未完成

示例

输入
solve()
期望输出
Avg span duration (ms):
  data-ingestion/parse: avg=9.0ms p99=9.0ms
  data-ingestion/validate: avg=9.0ms p99=9.0ms
  device-gateway/receive_payload: avg=5.0ms p99=5.0ms
  timeseries-db/store: avg=34.0ms p99=34.0ms <- BOTTLENECK
Slowest span: timeseries-db/store
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