Rails tracing produces duplicate mysql2 spans

[mmarinaccio]

Current behaviour After upgrading to version 2.2.0 of this gem, I'm now seeing duplicate mysql spans for my Rails application. It seems that both active_record and mysql2 components are producing redundant traces. I've tried disabling them but it they continue to appear.

Expected behaviour A single mysql2 span for each mysql2 request made in my app process.

Steps to reproduce

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Environment

• datadog version: 2.2.0
• Configuration block (Datadog.configure ...):

require 'datadog'

Datadog.configure do |c|
  c.env = Rails.env
  c.tracing.enabled = Rails.application.config.datadog_enabled

  # activate rails and framework configuration - https://docs.datadoghq.com/tracing/setup/ruby/#library-compatibility
  c.tracing.instrument :rails, enabled: true
  c.tracing.instrument :redis, enabled: true
  c.tracing.instrument :sidekiq, enabled: true, service_name: 'loyalsnap-sidekiq'
  c.tracing.instrument :rest_client, enabled: true, service_name: 'loyalsnap-rest-client'
  c.tracing.instrument :mysql2, enabled: false
  c.tracing.instrument :active_record, enabled: false
end

• Ruby version: 3.3.3
• Operating system: Ubuntu 22.04.4 LTS
• Relevant library versions: Rails 6.1.7.7