Returns the load balancer service ID for the command

# MongoDB\Driver\Monitoring\CommandStartedEvent::getServiceId

(mongodb >=1.11.0)

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

### Description

final public MongoDB\Driver\Monitoring\CommandStartedEvent::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.

### 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.

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