# MongoDB\Driver\Monitoring\CommandFailedEvent::getServiceId

(mongodb >=1.11.0)

MongoDB\Driver\Monitoring\CommandFailedEvent::getServiceId — Returns the load balancer service ID for the command

### Descripción

final public MongoDB\Driver\Monitoring\CommandFailedEvent::getServiceId(): ?MongoDB\BSON\ObjectId

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.

### Parámetros

Esta función no tiene parámetros.

### Valores devueltos

Returns the load balancer service ID, or `null` if the driver is not connected to a load balancer.

### Errores/Excepciones

- Lanza una MongoDB\Driver\Exception\InvalidArgumentException en errores de análisis de argumentos.