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Span ID The ID of the Span. It is globally unique with practically sufficient probability by being made as 8 randomly generated bytes, encoded as a 16 lowercase hex characters corresponding to 64 bits.
Trace flags to propagate.
It is represented as 1 byte (bitmap). Bit to represent whether trace is sampled or not. When set, the least significant bit documents that the caller may have recorded trace data. A caller who does not record trace data out-of-band leaves this flag unset.
SAMPLED = 0x1 and UNSAMPLED = 0x0;
Trace ID The ID of the trace that this span belongs to. It is worldwide unique with practically sufficient probability by being made as 16 randomly generated bytes, encoded as a 32 lowercase hex characters corresponding to 128 bits.
TraceState Tracing-system-specific info to propagate.
The tracestate field value is a list as defined below. The list is a
series of list-members separated by commas ,, and a list-member is a
key/value pair separated by an equals sign =. Spaces and horizontal tabs
surrounding list-members are ignored. There can be a maximum of 32
list-members in a list.
More Info: https://www.w3.org/TR/trace-context/#tracestate-field
Examples: Single tracing system (generic format): tracestate: rojo=00f067aa0ba902b7 Multiple tracing systems (with different formatting): tracestate: rojo=00f067aa0ba902b7,congo=t61rcWkgMzE
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Defines the span context A SpanContext represents the portion of a Span which must be serialized and propagated along side of a distributed context.