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Exporting span is divided into 3 stages：
  a. Support exporting span to back-end directly, such as zipkin.
  b. Introduce otel collector, support exporting span to otel collector.
  c. Support exporting span to doris.

Load trace collection and export:

Scheduling

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Query trace

1. Support trace and basic span collection and export：
2. Support span to record query profile related counter information：
3. Support to export span to otel collector, support to filter and process span through otel collector, and support to export span to multiple back-end：