# Package io.vertx.core.spi.tracing

- Interface Summary
  Interface | Description
  --- | ---
  TagExtractor<T> | This provides an utility for extracting request/response tags, potentially allocation-free.
  VertxTracer<I,O> | The tracer SPI used by Vert.x components to report activities.

- Enum Summary
  Enum | Description
  --- | ---
  SpanKind |

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