if Danbooru.config.elastic_apm_server_url.present?
  require "elastic_apm"

  # https://www.elastic.co/guide/en/apm/agent/ruby/4.x/api.html#api-agent-start
  # https://www.elastic.co/guide/en/apm/agent/ruby/4.x/configuration.html
  ElasticAPM::Rails.start(
    server_url: Danbooru.config.elastic_apm_server_url,
    service_name: "Danbooru",
  )
end