Jetpack_Heartbeat::deactivate PHP Method

    public function deactivate()
    {
        // Deal with the old pre-3.0 weekly one.
        if ($timestamp = wp_next_scheduled('jetpack_heartbeat')) {
            wp_unschedule_event($timestamp, 'jetpack_heartbeat');
        }
        $timestamp = wp_next_scheduled($this->cron_name);
        wp_unschedule_event($timestamp, $this->cron_name);
    }