kifibundle.module

<?php

use Drupal\Core\Form\FormStateInterface;

function kifibundle_form_system_logging_settings_alter(&$form, FormStateInterface $form_state) {
  $config = Drupal::configFactory()->getEditable('kifibundle.logging');
  $log_errors = $config->get('log_errors');

  $form['kifibundle'] = [
    '#tree' => true,
    'log_errors' => [
      '#type' => 'checkboxes',
      '#title' => t('Logged HTTP errors'),
      '#options' => [
        403 => t('403 - Forbidden'),
        404 => t('404 - Not Found'),
      ],
      '#default_value' => $log_errors,
    ]
  ];

  $form['#submit'][] = 'kifibundle_logging_settings_submit';
}

function kifibundle_logging_settings_submit(&$form, FormStateInterface $form_state) {
  $log_errors = $form_state->getValue(['kifibundle', 'log_errors']);
  $log_errors = array_keys(array_filter($log_errors));

  $config = Drupal::configFactory()->getEditable('kifibundle.logging');
  $config->set('log_errors', array_filter($log_errors));
  $config->save();
}

function kifibundle_views_data() {
  $data['views']['kifibundle_twig_inline'] = [
    'title' => t('Inline template'),
    'help' => t('Render text as template. Twig formatting is supported.'),
    'area' => [
      'id' => 'kifibundle_twig_inline'
    ]
  ];

  return $data;
}