Imports go.opentelemetry.io/otel/exporters/otlp/otlptrace go.opentelemetry.io/proto/otlp/collector/trace/v1 go.opentelemetry.io/proto/otlp/trace/v1 google.golang.org/grpc google.golang.org/grpc/metadata Standard library imports context errors fmt math/rand sync sync/atomic time unsafe