Imports go.opentelemetry.io/otel/api/propagation go.opentelemetry.io/otel/semconv github.com/gin-gonic/gin go.opentelemetry.io/otel/label go.opentelemetry.io/otel/api/trace go.opentelemetry.io/otel/api/global go.opentelemetry.io/otel/codes Standard library imports fmt