BitLogger

Trace-context

TraceContext carries the standard log fields used to correlate records with distributed traces: trace_id, span_id, trace_flags, and optional trace_state.

moonbit

let context = trace_context(
  "4bf92f3577b34da6a3ce929d0e0e4736",
  "00f067aa0ba902b7",
  trace_state="vendor=value",
)

Valid W3C values are normalized through moonbit-community/opentelemetry: 32-digit trace ids, 16-digit span ids, and 2-digit trace flags are rewritten with TraceId, SpanId, and TraceFlags. trace_state is parsed with TraceState::from_header. Values that are not valid hex stay unchanged, so application-local identifiers still bind as fields.

Use context.as_fields() when integrating with a custom carrier, or pass the value to a logger's with_trace_context(...) helper. BitLogger does not parse HTTP headers or export OTLP data; an application-owned tracing library remains responsible for propagation and sampling.

Trace-context ​

Trace-context