code: def _parse_source_file_list_blob_key(blob_key):
      """Parse the BLOB key for source file list.
  
      Args:
        blob_key: The BLOB key to parse. By contract, it should have the format:
         `${SOURCE_FILE_LIST_BLOB_TAG}.${run_id}`
  
      Returns:
        - run ID
      """
      return blob_key[blob_key.index(".") + 1 :]
  
imports: import json
  from tensorboard.data import provider
  from tensorboard.plugins.debugger_v2 import debug_data_multiplexer
label_desc: Use image node_id 16 for calling a global function with example usage: _parse_source_file_list_blob_key(blob_key) and returns: blob_key