Module axum

This module contains types which can be used as [axum] layers to produce OpenTelemetry compatible HTTP spans.

These spans include a wide variety of fields / attributes defined by the semantic conventions specification. A few examples are:

• http.request.method
• http.response.status_code
• user_agent.original

Structs

• HeaderExtractor
  Extracts the TextMapPropagator to access trace parent information in HTTP headers.
• HeaderInjector
  Injects the TextMapPropagator to propagate trace parent information in HTTP headers.
• ResponseFuture
  This future contains the inner service future and the current [Span].
• TraceLayer
  A Tower Layer which decorates TraceService.
• TraceService
  A Tower [Service] which injects Span Context into HTTP Response Headers.

Enums

• ServerHostError
  Errors which can be encountered when extracting the server host from a [Request].

Traits

• RequestExt
  This trait provides various helper functions to extract data from a HTTP [Request].
• SpanExt
  This trait provides various helper functions to create a [Span] out of an HTTP [Request].