code: def check_and_flush(self):
      if self.app_tracker is None:
          return
      with self.lock:
          if not self.data:
              return
      t = time.time()
      freq = self.frequency
      if self.commits_count < WARMUP_COMMITS:
          freq /= 2 ** (WARMUP_COMMITS - self.commits_count)
      if (
          self.data.get("stderr", "") != ""
          or self.commits_count == 0
          or t - self.last_committed > freq
      ):
          self.commits_count += 1
          self.app_tracker.has_data(self)
  
imports: import sys
  import threading
  import time
  from io import StringIO
  from typing import Optional
  from labml.internal.app import AppTracker, AppTrackDataSource, Packet
label_desc: Use image node_id 3 for calling the AppConsoleLogs obj's underlying member method code with example usage: obj.check_and_flush() without return types