Add Layer for Context Propagation #62
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jtescher
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May 7, 2020
This adds an implementation of the [Correlations API](https://github.com/open-telemetry/opentelemetry-specification/blob/master/specification/correlationcontext/api.md) which is used to annotate telemetry, adding context and information to metrics, traces, and logs. It is an abstract data type represented by a set of name/value pairs describing user-defined properties. Example: ```rust let propagator = CorrelationContextPropagator::new(); // can extract from any type that impls `Carrier`, usually an HTTP header map let cx = propagator.extract(&headers); // Iterate over extracted name / value pairs for (name, value) in cx.correlation_context() { // ... } // Add new correlations let cx_with_additions = cx.with_correlations(vec![Key::new("server_id").u64(42)]); // Inject correlations into http request propagator.inject_context(&cx_with_additions, &mut headers); ``` Resolves #62
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See open-telemetry/oteps#66 for context
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