Imports go.opentelemetry.io/otel go.opentelemetry.io/otel/attribute go.opentelemetry.io/otel/exporters/stdout/stdouttrace go.opentelemetry.io/otel/propagation go.opentelemetry.io/otel/sdk/resource go.opentelemetry.io/otel/sdk/trace go.opentelemetry.io/otel/semconv/v1.4.0 Standard library imports context fmt os