caching

tags:
  - { name: cache_prewarmable }

/**
  * Implements \Drupal\Core\PreWarm\PreWarmableInterface.
  */
public function preWarm(): void {
  $this->getDefinitions();
}

<?php

apcu_clear_cache();
opcache_reset();

  renderer.config:
    required_cache_contexts: ['languages:language_interface', 'theme', 'user.permissions']
    auto_placeholder_conditions:
      max-age: 0
      contexts: ['session', 'user']
      tags: []
    debug: true # The debug setting