(mongodb >=1.3.0)
MongoDB\Driver\Monitoring\CommandStartedEvent::getRequestId — Returns the command's request ID
The request ID is generated by the driver and may be used to associate this MongoDB\Driver\Monitoring\CommandStartedEvent with a later MongoDB\Driver\Monitoring\CommandFailedEvent or MongoDB\Driver\Monitoring\CommandSucceededEvent.
This function has no parameters.
Returns the command's request ID.