code: def timestamp():
      """Returns an integer use for run timestamps.
  
      Ensures that subsequent calls return increasing values.
      """
      ts = time.time_ns() // 1000
      with __last_ts_lock:
          if __last_ts is not None and __last_ts >= ts:
              ts = __last_ts + 1
          globals()["__last_ts"] = ts
      return ts
  
imports: import os
  import random
  import threading
  import time
  import uuid
  import yaml
  from guild import opref
  from guild import util
  from guild import yaml_util
label_desc: Use image node_id 2 for calling a global function with example usage: timestamp() and returns: ts