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 | MongoDB\Driver\Monitoring\ServerHeartbeatFailedEvent::isAwaitedReturns whether the heartbeat used a streaming protocol 説明
   final public bool MongoDB\Driver\Monitoring\ServerHeartbeatFailedEvent::isAwaited() 
   Returns whether the heartbeat used a streaming protocol. The extension does
   not use the streaming protocol for monitoring, so this method will always
   return  パラメータこの関数にはパラメータはありません。 戻り値
   Returns  エラー / 例外
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