code: def __add_stack(self, span, limit=None):
          
          span.stack = []
          frame_count = 0
  
          tb = traceback.extract_stack()
          tb.reverse()
          for frame in tb:
              if limit is not None and frame_count >= limit:
                  break
  
              # Exclude Instana frames unless we're in dev mode
              if "INSTANA_DEV" not in os.environ:
                  if re_tracer_frame.search(frame[0]) is not None:
                      continue
  
                  if re_with_stan_frame.search(frame[2]) is not None:
                      continue
  
              span.stack.append({
                  "c": frame[0],
                  "n": frame[1],
                  "m": frame[2]
              })
  
              if limit is not None:
                  frame_count += 1
docs: Adds a backtrace to this span