This patch is based on https://github.com/DataDog/dd-trace-rb/pull/798 and can be added (e.g., as a rails initializer) to provide more meaningful trace labels rather than `Sidekiq::Extensions::DelayedClass`.

patch_datadog_sidekiq_traces.rb

module Datadog
  module Contrib
    module Sidekiq
      module Tracing
        def job_resource(job)
          if job['wrapped']
            job['wrapped']
          elsif job['class'] == 'Sidekiq::Extensions::DelayedClass'
            YAML.load(job['args'].first)[0..1].join('.') rescue job['class'] # rubocop:disable Security/YAMLLoad
          else
            job['class']
          end
        end
      end
    end
  end
end