docs: def _tracing_information():
      """Gets B3 distributed tracing information, if available.
       This is returned as a list, ready to be formatted into Spring Cloud Sleuth compatible format.
       """
  
      # We'll collate trace information if the B3 headers have been collected:
      values = b3.values()
      if values[b3.b3_trace_id]:
          # Trace information would normally be sent to Zipkin if either of sampled or debug ("flags") is set to 1
          # However we're not currently using Zipkin, so it's always false
          # exported = "true" if values[b3.b3_sampled] == '1' or values[b3.b3_flags] == '1' else "false"
  
          return [
              current_app.name if current_app.name else " - ",
              values[b3.b3_trace_id],
              values[b3.b3_span_id],
              "false",
          ]