The core of open telemetry instrumentation is the OpenTelemetry API/SDK. The initial aim of this shard is to implement the OpenTelemetry specification for metrics, traces, and logs.
Now that Context and TraceContext work, a Baggage implementation should be straightforward.
Baggage is a mechanism for sharing state (context) during a distributed request. Whereas tracestate is intended to be used specifically for parameters that are relevant to the tracing mechanisms in use, Baggage is a general-purpose mechanism intended to provide a header that can be used to share arbitrary data throughout a distributed trace.
Its implementation can be significantly lifted from that of TraceContext (and, in fact, I think that some of what TraceContext does may be overzealous, and should be removed when it is implemented in Baggage, particularly as it relates to the OpenTelemetry::Context parameters being inserted into tracestate).
https://www.w3.org/TR/baggage/
Now that Context and TraceContext work, a Baggage implementation should be straightforward.
Baggage is a mechanism for sharing state (context) during a distributed request. Whereas
tracestateis intended to be used specifically for parameters that are relevant to the tracing mechanisms in use,Baggageis a general-purpose mechanism intended to provide a header that can be used to share arbitrary data throughout a distributed trace.Its implementation can be significantly lifted from that of TraceContext (and, in fact, I think that some of what TraceContext does may be overzealous, and should be removed when it is implemented in Baggage, particularly as it relates to the OpenTelemetry::Context parameters being inserted into
tracestate).