code: def unset_should_persist(line):
      # prior to persisting, the should_persist marker should be removed
      # from the logline using this function
      line = to_bytes(line)
      if is_structured(line) and line.startswith(b"[!["):
          return line[2:]
      else:
          return line
  
file_path: metaflow/metaflow/mflog/mflog.py
imports: import heapq
  import re
  import time
  import uuid
  from datetime import datetime
  from collections import namedtuple
  from metaflow.util import to_bytes, to_fileobj, to_unicode
label_desc: Use image node_id 5 for calling a global function with example usage: unset_should_persist(line) and returns: line, line