code: def _client_expired(self):
      if not isinstance(self.bedrock_config.aws_config, AWSRole):
          return False
  
      return (
          (time.monotonic_ns() - self._client_created)
          >= (self.bedrock_config.aws_config.session_length_seconds)
          * 1_000_000_000,
      )
  
imports: import json
  import time
  from enum import Enum
  import boto3
  import botocore.config
  import botocore.exceptions
  from fastapi import HTTPException
  from fastapi.encoders import jsonable_encoder
  from mlflow.gateway.config import AWSBedrockConfig, AWSIdAndKey, AWSRole, RouteConfig
  from mlflow.gateway.constants import MLFLOW_AI_GATEWAY_ANTHROPIC_DEFAULT_MAX_TOKENS
  from mlflow.gateway.exceptions import AIGatewayConfigException
  from mlflow.gateway.providers.anthropic import AnthropicAdapter
  from mlflow.gateway.providers.base import BaseProvider, ProviderAdapter
  from mlflow.gateway.providers.cohere import CohereAdapter
  from mlflow.gateway.providers.utils import rename_payload_keys
  from mlflow.gateway.schemas import chat, completions, embeddings
label_desc: Use image node_id 2 for calling the AWSBedrockProvider obj's underlying member method code with example usage: obj._client_expired() and returns: unknown, False