NH-109213: patch response_propagators that nonrecording span still inject to response header

Author: xuan-cao-swi

lib/solarwinds_apm/otel_config.rb

@@ -77,6 +77,8 @@ def self.initialize
         c.use_all(@@config_map)
       end
 
+      require_relative 'patch/instrumentation_patch'
+
       # append our propagators
       ::OpenTelemetry.propagation.instance_variable_get(:@propagators).append(SolarWindsAPM::OpenTelemetry::SolarWindsPropagator::TextMapPropagator.new)
 

lib/solarwinds_apm/patch/instrumentation_patch.rb

@@ -0,0 +1,33 @@
+# frozen_string_literal: true
+
+# © 2025 SolarWinds Worldwide, LLC. All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at:http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.
+
+module SolarWindsAPM
+  module Instrumentation
+    module Rack
+      module Middlewares
+        module Patch
+          # rubocop:disable Lint/UnusedMethodArgument
+          def on_commit(request, response)
+            response_propagators&.each do |propagator|
+              propagator.inject(response.headers)
+            rescue StandardError => e
+              ::OpenTelemetry.handle_error(message: 'Unable to inject response propagation headers', exception: e)
+            end
+          rescue StandardError => e
+            ::OpenTelemetry.handle_error(exception: e)
+          end
+          # rubocop:enable Lint/UnusedMethodArgument
+        end
+      end
+    end
+  end
+end
+
+OpenTelemetry::Instrumentation::Rack::Middlewares::Stable::EventHandler.prepend(SolarWindsAPM::Instrumentation::Rack::Middlewares::Patch) if defined?(OpenTelemetry::Instrumentation::Rack::Middlewares::Stable::EventHandler)
+OpenTelemetry::Instrumentation::Rack::Middlewares::Old::EventHandler.prepend(SolarWindsAPM::Instrumentation::Rack::Middlewares::Patch) if defined?(OpenTelemetry::Instrumentation::Rack::Middlewares::Old::EventHandler)
+OpenTelemetry::Instrumentation::Rack::Middlewares::Dup::EventHandler.prepend(SolarWindsAPM::Instrumentation::Rack::Middlewares::Patch) if defined?(OpenTelemetry::Instrumentation::Rack::Middlewares::Dup::EventHandler)