code: def _initialize_context(self, trace_header):
          
          sampled = None
          if not global_sdk_config.sdk_enabled():
              # Force subsequent subsegments to be disabled and turned into DummySegments.
              sampled = False
          elif trace_header.sampled == 0:
              sampled = False
          elif trace_header.sampled == 1:
              sampled = True
  
          segment = FacadeSegment(
              name='facade',
              traceid=trace_header.root,
              entityid=trace_header.parent,
              sampled=sampled,
          )
          setattr(self._local, 'segment', segment)
          setattr(self._local, 'entities', [])
docs: Create a facade segment based on environment variables
          set by AWS Lambda and initialize storage for subsegments.