tracing-opentelemetry-instrumentation-sdk

Provide a set of helpers to build [OpenTelemetry] instrumentation based on [tracing] crate, and following the OpenTelemetry Trace Semantic Conventions.

PS: Contributions are welcome (bug report, improvements, features, ...)

Notes

[tracing-opentelemetry] extends [tracing] to interoperate with [OpenTelemetry]. But with some constraints:

• Creation of the OpenTelemetry's span is done when the tracing span is closed. So do not try to interact with OpenTelemetry Span (or SpanBuilder) from inside the tracing span.
• The OpenTelemetry parent Context (and traceid) is created on NEW span or inherited from parent span. The parent context can be overwritten after creation, but until then the trace_id is the one from NEW, So tracing's log could report none or not-yet set traceid on event NEW and the following until update.
• To define kind, name,... of OpenTelemetry's span from tracing's span used special record's name: otel.name, otel.kind, ...

Record in a [tracing]'s Span should be defined at creation time. So some field are created with value tracing::field::Empty to then being updated.