fix: Update Net::HTTP instrumentation to no-op on untraced contexts

instrumentation/net_http/lib/opentelemetry/instrumentation/net/http/patches/instrumentation.rb

@@ -86,12 +86,20 @@ def tracer
             end
 
             def untraced?
+              untraced_context? || untraced_host?
+            end
+
+            def untraced_host?
               return true if Net::HTTP::Instrumentation.instance.config[:untraced_hosts]&.any? do |host|
                 host.is_a?(Regexp) ? host.match?(@address) : host == @address
               end
 
               false
             end
+
+            def untraced_context?
+              OpenTelemetry::Common::Utilities.untraced?
+            end
           end
         end
       end

instrumentation/net_http/opentelemetry-instrumentation-net_http.gemspec

@@ -34,6 +34,7 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency 'opentelemetry-sdk', '~> 1.1'
   spec.add_development_dependency 'opentelemetry-test-helpers', '~> 0.3'
   spec.add_development_dependency 'rake', '~> 13.0.1'
+  spec.add_development_dependency 'rspec-mocks'
   spec.add_development_dependency 'rubocop', '~> 1.56.1'
   spec.add_development_dependency 'simplecov', '~> 0.17.1'
   spec.add_development_dependency 'webmock', '~> 3.19'

instrumentation/net_http/test/opentelemetry/instrumentation/net/http/instrumentation_test.rb

@@ -178,6 +178,34 @@
         _(span.attributes['net.peer.port']).must_equal(80)
       end
     end
+
+    describe 'untraced context' do
+      it 'no-ops on #request' do
+        # Calling `tracer.in_span` within an untraced context causes the logging of "called
+        # finish on an ended Span" messages. To avoid log noise, the instrumentation must
+        # no-op (i.e., not call `tracer.in_span`) when the context is untraced.
+        expect(instrumentation.tracer).not_to receive(:in_span)
+
+        OpenTelemetry::Common::Utilities.untraced do
+          Net::HTTP.get('example.com', '/body')
+        end
+
+        _(exporter.finished_spans.size).must_equal 0
+      end
+
+      it 'no-ops on #connect' do
+        expect(instrumentation.tracer).not_to receive(:in_span)
+
+        OpenTelemetry::Common::Utilities.untraced do
+          uri = URI.parse('http://example.com/body')
+          http = Net::HTTP.new(uri.host, uri.port)
+          http.send(:connect)
+          http.send(:do_finish)
+        end
+
+        _(exporter.finished_spans.size).must_equal 0
+      end
+    end
   end
 
   describe '#connect' do

instrumentation/net_http/test/test_helper.rb

@@ -9,6 +9,7 @@
 Bundler.require(:default, :development, :test)
 
 require 'minitest/autorun'
+require 'rspec/mocks/minitest_integration'
 require 'webmock/minitest'
 
 # global opentelemetry-sdk setup: