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Add "tracestate" propagation #690

Merged
merged 1 commit into from Dec 17, 2019
Merged

Add "tracestate" propagation #690

merged 1 commit into from Dec 17, 2019

Commits on Dec 17, 2019

  1. Add "tracestate" propagation

    Add the field TraceContext.State, which has the new
    type TraceState. TraceState is an opaque type, which
    internally contains a list of TraceStateEntry objects.
    
    When starting a transaction with StartTransactionOptions,
    the TraceContext.State field will only be considered if
    both TraceContext.Trace and TraceContext.State are valid.
    If this is true, then the state will be stored on the
    transaction, and spans created using the transaction.
    
    Server instrumentation in apmhttp, apmgrpc, and apmot
    will extract and parse "tracestate" headers, while client
    instrumentation will inject "tracestate" headers.
    
    Add missing docs for `ELASTIC_APM_USE_ELASTIC_TRACEPARENT_HEADER`.
    axw committed Dec 17, 2019
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