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Distributed tracing

OpenTelemetry tracing is disabled by default. Set OTEL_TRACING_ENABLED=true to create HTTP, Express, and NestJS spans and export them using OTLP/HTTP. The exporter defaults to http://localhost:4318/v1/traces. Point it at your collector with OTEL_EXPORTER_OTLP_TRACES_ENDPOINT; optionally set OTEL_SERVICE_NAME (default stellar-tickets-backend).

OTEL_TRACING_ENABLED=true
OTEL_SERVICE_NAME=stellar-tickets-backend
OTEL_EXPORTER_OTLP_TRACES_ENDPOINT=http://localhost:4318/v1/traces

Start an OTLP-compatible collector before starting the API. In containers, localhost refers to the API container, so use your collector's service name. Incoming W3C traceparent headers are propagated and outgoing HTTP requests can join the same trace. Do not attach credentials, request bodies, or ticket data as span attributes.

Set OTEL_TRACING_ENABLED=false (or leave it unset) to disable tracing. The SDK and instrumentations are then not loaded and no spans are exported.