Can not get the array of entities config from within the Command

command.php

protected function execute(InputInterface $input, OutputInterface $output)
    {
        $container = $this->getContainer();

        $doctrine = $container->get('doctrine');

        $monitoringEntities = $container->getParameter('monitoring.entities');

        foreach ($monitoringEntities as $monitoringEntity) {
            $output->writeln($monitoringEntity);
            // let's try to get monitoring.entities.entity1 array
            print_r($container->getParameter($monitoringEntity)); // <=-- this throws an InvalidArgumentException exception, can't find the parameter
        }
    }

config.yml

monitoring:
    entities:
        entity1:
            day_time:
                from: 9
                to: 19
            day_time_gap: 5
            night_time_gap: 15
        entity2:
            day_time:
                from: 7
                to: 21
            day_time_gap: 1
            night_time_gap: 5

configuration.php

class Configuration implements ConfigurationInterface
{
    /**
     * {@inheritdoc}
     */
    public function getConfigTreeBuilder()
    {
        $treeBuilder = new TreeBuilder();
        $rootNode = $treeBuilder->root('monitoring');

        $rootNode
            ->children()
                ->append($this->getEntitiesNode())
            ->end()
        ;

        return $treeBuilder;
    }

    private function getEntitiesNode()
    {
        $treeBuilder = new TreeBuilder();
        $node = $treeBuilder->root('entities');

        $timingsNode = $node
            ->requiresAtLeastOneElement()
            ->useAttributeAsKey('name')
            ->prototype('array')
        ;

        $timingsNode
            ->children()
                ->arrayNode('day_time')
                    ->children()
                        ->integerNode('from')->defaultValue(9)->end()
                        ->integerNode('to')->defaultValue(19)->end()
                    ->end()
                ->end()
                ->integerNode('day_time_gap')->defaultValue(5)->end()
                ->integerNode('night_time_gap')->defaultValue(15)->end()
            ->end()
        ;

        return $node;
    }
}

extension.php

public function load(array $configs, ContainerBuilder $container)
    {
        $configuration = new Configuration();
        $config = $this->processConfiguration($configuration, $configs);

        $timings = [];

        foreach (array_keys($config['entities']) as $name) {
            $timings[$name] = sprintf('monitoring.entities.%s_entity', $name);
        }

        $container->setParameter('monitoring.entities', $timings);

        $loader = new Loader\XmlFileLoader($container, new FileLocator(__DIR__.'/../Resources/config'));
        $loader->load('services.xml');
    }