Rails Auto Instrument not setting _dd.base_service for supported auto instrument integrations.

[jatindhankhar]

Current behaviour

Auto Instrumentation in the tracing tag isn't setting the _dd.base_service which leads to un-necessary service creation in the APM services page, ideally these services should be clubbed inside the main service.

[
 Name: redis.command
Span ID: 2021611852373594644
Parent ID: 0
Trace ID: 136909362328890433043090706524994463831
Type: redis
Service: service-name-here
Resource: GET
Error: 0
Start: 1728039096734483968
End: 1728039096742849024
Duration: 0.008146000000124332
Tags: [
   env => development,
   component => redis,
   operation => command,
   peer.hostname => localhost,
   span.kind => client,
   db.system => redis,
   out.host => localhost,
   db.redis.database_index => 0,
   redis.raw_command => GET 1,
   _dd.peer.service.source => peer.hostname,
   peer.service => localhost]
Metrics: [
   out.port => 6379.0,
   out.redis_db => 0.0,
   _dd.top_level => 1.0]]

Expected behaviour

[
 Name: redis.command
Span ID: 1232186374065000963
Parent ID: 0
Trace ID: 136909365101876121041739081064156880567
Type: redis
Service: external-access-manager-service_redis
Resource: GET
Error: 0
Start: 1728039131787262976
End: 1728039131791028992
Duration: 0.0037690000026486814
Tags: [
   env => development,
   _dd.base_service => service-name-here
   component => redis,
   operation => command,
   peer.hostname => localhost,
   span.kind => client,
   db.system => redis,
   out.host => localhost,
   db.redis.database_index => 0,
   redis.raw_command => GET 1,
   _dd.peer.service.source => peer.hostname,
   peer.service => localhost]
Metrics: [
   out.port => 6379.0,
   out.redis_db => 0.0,
   _dd.top_level => 1.0]]

Had to add following line

config.tracing.instrument :redis, service_name: config.service + "_" + "redis"

Steps to reproduce

Using Datadog's automatic instrumenation guide - https://docs.datadoghq.com/tracing/trace_collection/automatic_instrumentation/dd_libraries/ruby/ by setting

Gemfile

source 'https://rubygems.org'
gem 'datadog', require: 'datadog/auto_instrument'

config/initializers/datadog.rb

Datadog.configure do |config|
  ## https://docs.datadoghq.com/containers/amazon_ecs/apm/?tab=ec2metadataendpoint#imdsv2.
  ## For task running inside ECS we need to fetch the host IP where the container is running as a daemon :|
  # https://docs.datadoghq.com/tracing/trace_collection/automatic_instrumentation/dd_libraries/ruby/#additional-configuration
  config.service = 'service_name'
  config.agent.host = fetch_ecs_host_ip
  config.profiling.enabled = true
  config.env = Rails.env
  # Changes the default value for service_name to the application service name across all instrumentation
  config.tracing.contrib.global_default_service_name.enabled = true
  config.diagnostics.debug = true
end

How does datadog help you?

Environment

• datadog version: 2.3.0
• Configuration block

Datadog.configure do |config|
  ## https://docs.datadoghq.com/containers/amazon_ecs/apm/?tab=ec2metadataendpoint#imdsv2.
  ## For task running inside ECS we need to fetch the host IP where the container is running as a daemon :|
  # https://docs.datadoghq.com/tracing/trace_collection/automatic_instrumentation/dd_libraries/ruby/#additional-configuration
  config.service = 'service_name'
  config.agent.host = fetch_ecs_host_ip
  config.profiling.enabled = true
  config.env = Rails.env
  # Changes the default value for service_name to the application service name across all instrumentation
  config.tracing.contrib.global_default_service_name.enabled = true
  config.diagnostics.debug = true
end

• Ruby version: ruby 3.3.0p0
• Operating system: Not Relevant
• Relevant library versions:

[jatindhankhar]

dd-trace-rb/lib/datadog/tracing/contrib/auto_instrument.rb

Lines 43 to 48 in 40837e3

	integrations.each do |integration_name|
	c.tracing.instrument integration_name
	end
	end
	end
	end

This should be changed to

integrations.each do |integration_name|
  c.tracing.instrument service_name: config.service + "_" + integration_name
end