# MongoDB\Driver\Monitoring\CommandSubscriber::commandFailed

(mongodb >=1.3.0)

MongoDB\Driver\Monitoring\CommandSubscriber::commandFailed — Notification method for a failed command

### Description

abstract public MongoDB\Driver\Monitoring\CommandSubscriber::commandFailed ( MongoDB\Driver\Monitoring\CommandFailedEvent `$event` ) : void

If the subscriber has been registered with MongoDB\Driver\Monitoring\addSubscriber(), the driver will call this method when a command has failed.

### Parameters

`event` (MongoDB\Driver\Monitoring\CommandFailedEvent)

  An event object encapsulating information about the failed command.

### Return Values

No value is returned.

### Errors/Exceptions

- Throws MongoDB\Driver\Exception\InvalidArgumentException on argument parsing errors.

### See Also

- MongoDB\Driver\Monitoring\CommandFailedEvent
- MongoDB\Driver\Monitoring\addSubscriber() - Registers a new monitoring event subscriber
- Application Performance Monitoring (APM)