code: def mark_uploaded(self, is_uploaded):
      self._upload_stats.add_blob(
          self._blob_bytes, is_skipped=(not is_uploaded)
      )
  
imports: import contextlib
  from datetime import datetime
  import sys
  import time
label_desc: Use image node_id 2 for calling the _BlobTracker obj's underlying member method code with example usage: obj.mark_uploaded(is_uploaded) without return types