[NO-TICKET] RFC: Add logger gem as dependency to prepare for future Ruby versions

.gitlab/install_datadog_deps.rb

@@ -78,12 +78,14 @@
   'DD_PROFILING_NO_EXTENSION' => 'true',
 }
 
+# ADD NEW DEPENDENCIES HERE
 [
   'datadog-ruby_core_source',
   'ffi',
   'libddwaf',
   'msgpack',
   'libdatadog', # libdatadog MUST be installed before datadog to ensure libdatadog native extension is compiled
+  'logger',
   'datadog',
 ].each do |gem|
   version = gem_version_mapping.delete(gem)

datadog.gemspec

@@ -71,6 +71,16 @@ Gem::Specification.new do |spec|
   # (and yes we have a test for it)
   spec.add_dependency 'libdatadog', '~> 14.3.1.1.0'
 
+  # Will no longer be a default gem on Ruby 3.5, see
+  # https://github.com/ruby/ruby/commit/d7e558e3c48c213d0e8bedca4fb547db55613f7c and
+  # https://stdgems.org/ .
+  # We support all versions of this gem and don't particularly require any version restriction.
+  spec.add_dependency 'logger'
+
+  # Tip: When adding or removing dependencies, search the codebase for the string
+  # ADD NEW DEPENDENCIES HERE
+  # to find out a few more places that need to be kept in-sync.
+
   spec.extensions = [
     'ext/datadog_profiling_native_extension/extconf.rb',
     'ext/datadog_profiling_loader/extconf.rb',

lib-injection/host_inject_main.rb

@@ -175,12 +175,14 @@ def bundler_supported?
         injection_failure = false
 
         # This is order dependent
+        # ADD NEW DEPENDENCIES HERE
         [
           'msgpack',
           'ffi',
           'datadog-ruby_core_source',
           'libdatadog',
           'libddwaf',
+          'logger',
           'datadog'
         ].each do |gem|
           fork do

spec/datadog/release_gem_spec.rb

@@ -103,13 +103,15 @@
         # check `install_datadog_deps.rb` for details
         expect(gem_version_mapping.keys).to contain_exactly(
           # This list MUST NOT derive from the `gemspec.dependencies`,
-          # since it is used to alarm when dependencies  modified.
+          # since it is used to alarm when dependencies are modified.
+          # ADD NEW DEPENDENCIES HERE
           'datadog',
           'datadog-ruby_core_source',
           'ffi',
           'libdatadog',
           'libddwaf',
           'msgpack',
+          'logger',
         )
       end
     end