MongoDB\Driver\Monitoring\CommandFailedEvent::getServiceId
  Returns the load balancer service ID for the command
  
 
  Description
  
   final public MongoDB\BSON\ObjectIdnull MongoDB\Driver\Monitoring\CommandFailedEvent::getServiceId()
  
  
 
  Parameters
  This function has no parameters.
  
 
  Return Values
  
   Returns the load balancer service ID, or null if the driver is not
   connected to a load balancer.
  
  
 
  Errors/Exceptions
  
   - Throws MongoDB\Driver\Exception\InvalidArgumentException on argument parsing errors.