islandora/modules/islandora_breadcrumbs/islandora_breadcrumbs.services.yml

services:
  islandora_breadcrumbs.breadcrumb:
    class: Drupal\islandora_breadcrumbs\IslandoraBreadcrumbBuilder
    arguments: ['@entity_type.manager', '@config.factory']
    tags:
      - { name: breadcrumb_builder, priority: 100 }