code: def _behind_bytes(self) -> int:
      return (
          self._context.last_forwarded_offset
          - self._context.last_sent_offset
      )
  
imports: import logging
  from dataclasses import dataclass
  from typing import TYPE_CHECKING, Callable, Optional
  from wandb.proto import wandb_internal_pb2
  from wandb.sdk.lib import fsm
  from .settings_static import SettingsStatic
label_desc: Use image node_id 8 for calling the StateShared obj's underlying member method code with example usage: obj._behind_bytes() and returns: unknown