feat(otel): configure W3C trace propagation for distributed tracing#2506
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tdabasinskas wants to merge 1 commit intodocker:mainfrom
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feat(otel): configure W3C trace propagation for distributed tracing#2506tdabasinskas wants to merge 1 commit intodocker:mainfrom
tdabasinskas wants to merge 1 commit intodocker:mainfrom
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Set up composite text map propagator with TraceContext and Baggage to enable distributed tracing across service boundaries. Without this configuration, the SDK records spans locally but cannot chain them across HTTP requests. Wrap HTTP client transport with otelhttp when OTEL_EXPORTER_OTLP_ENDPOINT is set. This ensures outbound requests emit CLIENT spans and inject the W3C traceparent header, while incoming requests extract trace context. The wrapping is gated on the same environment variable check used in initOTelSDK to avoid allocating spans or sending headers when OpenTelemetry is disabled. Expose WrapWithOTel helper function so callers building custom transports can opt into the same env-gated instrumentation without duplicating the gating logic.
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Two small additions so traces emitted by the existing OTel SDK chain across processes:
Set the global
TextMapPropagatorto W3C TraceContext + Baggage incmd/root/otel.go. Without this, the SDK records spans locally but never injectstraceparenton outbound requests.Wrap the outbound transport in
pkg/httpclientwithotelhttp.NewTransport, gated onOTEL_EXPORTER_OTLP_ENDPOINT— the same env var that already gates exporter creation ininitOTelSDK.When OTel is disabled — behavior is unchanged. When enabled, each outbound HTTP call emits a CLIENT span and carries
traceparent, so cagent traces correlate with downstream gateway/proxy.