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MongoDB\Driver\Monitoring\CommandSubscriber	MongoDB\Driver\Monitoring\CommandSubscriber::commandStarted

MongoDB\Driver\Monitoring\CommandSubscriber	Last updated: Mon, 26 Oct 2026

MongoDB\Driver\Monitoring\CommandSubscriber::commandFailed

(mongodb >=1.3.0)

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

Description

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

If the subscriber is registered, this method is called when a command fails.

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 monitoring event subscriber globally
MongoDB\Driver\Manager::addSubscriber() - Registers a monitoring event subscriber with this Manager
Application Performance Monitoring (APM)

MongoDB\Driver\Monitoring\CommandSubscriber	MongoDB\Driver\Monitoring\CommandSubscriber::commandStarted

MongoDB\Driver\Monitoring\CommandSubscriber	Last updated: Mon, 26 Oct 2026