o11y-8.x-1.x-dev/modules/o11y_traces/o11y_traces.services.yml

services:
  monolog.processor.tracer:
    class: Drupal\o11y_traces\Logger\Processor\TracerProcessor
  o11y_traces.header_subscriber:
    class: Drupal\o11y_traces\EventSubscriber\HeaderSubscriber
    tags:
      - { name: event_subscriber }