(mongodb >=1.11.0)
MongoDB\Driver\Monitoring\CommandStartedEvent::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.
У цієї функції немає параметрів.
Returns the load balancer service ID, or null if the driver is not
connected to a load balancer.