bugfix: always apply transformations on booleans

v9.14.0 introduced improved handling of boolean based configuration
parameters and inadvertently broke AWS Lambda layer based functionality
due to a bypassing of config transformations for booleans.

Boolean based values will now again be routed through their
transformations if defined.

resolves #2919

CHANGELOG.md

@@ -2,7 +2,7 @@
 
 ## dev
 
-Version <dev> updates View Componment instrumentation to use a default metric name when one is unavailable, adds a configuration option to associate the AWS account ID with the DynamoDB calls from the AWS SDK, resolves a bug in rdkafka instrumentation when using the karafka-rdkafka gem, resolves a bug in the ruby-kafka instrumentation, and fixes a bug with Grape instrumentation.
+Version <dev> updates View Componment instrumentation to use a default metric name when one is unavailable, adds a configuration option to associate the AWS account ID with the DynamoDB calls from the AWS SDK, resolves a bug in rdkafka instrumentation when using the karafka-rdkafka gem, resolves a bug in the ruby-kafka instrumentation, fixes a bug with Grape instrumentation, and addresses a bug preventing Ruby based AWS Lambda layer contexts from working properly.
 
 
 - **Feature: New configuration option cloud.aws.account_id**
@@ -19,12 +19,15 @@ Version <dev> updates View Componment instrumentation to use a default metric na
 
 - **Bugfix: Stop calling deprecated all_specs method to check for the presence of newrelic-grape**
 
-  In 9.14.0, we released a fix for calls to the deprecated `Bundler.rubygems.all_specs`, but the fix fell short for the agent's Grape instrumentation and deprecation warnings could still be raised. The condition has been simplified and deprecation warnings should no longer be raised. Thank you, [@excelsior](https://github.com/excelsior) for bringing this to our attention. [Issue#](https://github.com/newrelic/newrelic-ruby-agent/issues/2885) [PR#2906](https://github.com/newrelic/newrelic-ruby-agent/pull/2906)
+  In 9.14.0, we released a fix for calls to the deprecated `Bundler.rubygems.all_specs`, but the fix fell short for the agent's Grape instrumentation and deprecation warnings could still be raised. The condition has been simplified and deprecation warnings should no longer be raised. Thank you, [@excelsior](https://github.com/excelsior) for bringing this to our attention. [Issue#2885](https://github.com/newrelic/newrelic-ruby-agent/issues/2885) [PR#2906](https://github.com/newrelic/newrelic-ruby-agent/pull/2906)
 
 - **Bugfix: Instrumentation errors when using the ruby-kafka gem**
 
   Kafka::Consumer#each_message takes keyword arguments, while the prepended method is defined with a single splat positional argument. In Ruby >= 3.0, this signature mismatch raises an ArgumentError. Thank you [@patrickarnett](https://github.com/patrickarnett) for providing this bugfix. [PR#2915](https://github.com/newrelic/newrelic-ruby-agent/pull/2915)
 
+- **Bugfix: Restore AWS Lambda layer based operational functionality**
+
+  Version 9.14.0 of the agent introduced an optimization related to how the agent handles boolean based configuration parameters which inadvertently caused the agent to stop operating properly in an AWS Lambda layer context. [Issue#2919](https://github.com/newrelic/newrelic-ruby-agent/issues/2919)
 
 ## v9.14.0
 

lib/new_relic/agent/configuration/manager.rb

@@ -143,7 +143,7 @@ def evaluate_and_apply_transformations(key, value)
           return default if default
 
           boolean = enforce_boolean(key, value)
-          return boolean if [true, false].include?(boolean)
+          evaluated = boolean if [true, false].include?(boolean)
 
           apply_transformations(key, evaluated)
         end

test/new_relic/agent/configuration/manager_test.rb

@@ -552,6 +552,23 @@ def phony_cache.dup; self[:dup_called] = true; self; end
       @manager.new_cache
     end
 
+    # https://github.com/newrelic/newrelic-ruby-agent/issues/2919
+    def test_that_boolean_based_params_always_go_through_any_defined_transform_sequence
+      key = :soundwave
+      defaults = {key => {default: false,
+                          public: true,
+                          type: Boolean,
+                          allowed_from_server: false,
+                          transform: proc { |bool| bool.to_s.reverse },
+                          description: 'Param what transforms'}}
+      NewRelic::Agent::Configuration.stub_const(:DEFAULTS, defaults) do
+        mgr = NewRelic::Agent::Configuration::Manager.new
+        value = mgr[key]
+
+        assert_equal 'eslaf', value, 'Expected `false` boolean value to be transformed!'
+      end
+    end
+
     private
 
     def assert_parsed_labels(expected)

test/new_relic/agent/serverless_handler_test.rb

@@ -467,6 +467,18 @@ def test_http_uri_handles_errors
         logger_mock.verify
       end
 
+      # https://github.com/newrelic/newrelic-ruby-agent/issues/2919
+      def test_env_var_will_properly_enable_serverless_mode
+        NewRelic::Agent.config.remove_config(@test_config)
+
+        ENV.stub(:key?, NewRelic::Agent::ServerlessHandler::LAMBDA_ENVIRONMENT_VARIABLE, true) do
+          NewRelic::Agent.config.send(:reset_cache)
+
+          assert NewRelic::Agent.config[:'serverless_mode.enabled'],
+            'Expected the presence of an env var to enable serverless mode!'
+        end
+      end
+
       private
 
       def handler