(mongodb >=1.11.0)
MongoDB\Driver\Monitoring\CommandFailedEvent::getServiceId — Returns the load balancer service ID for the command
When the driver is connected to a MongoDB cluster through a load balancer, the service ID corresponds to the serviceId
field in the hello
command response.
この関数にはパラメータはありません。
Returns the load balancer service ID, or null
if the driver is not connected to a load balancer.