With

Datadog.configure do |c|
  c.tracer env: Rails.env
  c.use :rails, service_name: "myapp-rails"
end

I see the following services instrumented in Datadog:

- active_record
- myapp-rails
- myapp-rails-cache
- myapp-rails-postgres

This is ok for one service, but I have multiple Rails apps (all using ActiveRecord) that I want to instrument, so I need to differentiate active_record from one app from another.

I understand there's c.use :active_record and c.use :rails, but I'm not sure why active_record is configured separately from rails. What I want is to have:

- myapp-active_record
- myapp-rails
- myapp-rails-cache
- myapp-rails-postgres

Is there a way to achieve this? I read this issue #574 and this PR #450, and it seems that the following is exactly what I need:

Datadog.configure do |c|
  c.use :rails do |rails|
    rails.service_name = 'myapp'
    
    rails.active_record do |active_record|
      active_record.orm_service_name = 'myapp-active_record'
    end
  end
end

But when I tried it I got a NoMethodError:

undefined method `active_record' for #<Datadog::Contrib::Rails::Configuration::Settings:0x00007ff12073d9d0> (NoMethodError)

I'm using 0.24.0.