manager.rb in newrelic_rpm-9.2.1

- old
+ new

@@ -13,10 +13,12 @@
 
 module NewRelic
   module Agent
     module Configuration
       class Manager
+        DEPENDENCY_DETECTION_VALUES = %i[prepend chain].freeze
+
         # Defining these explicitly saves object allocations that we incur
         # if we use Forwardable and def_delegators.
         def [](key)
           @cache[key]
         end
@@ -355,10 +357,21 @@
           @configs_for_testing = []
 
           reset_cache
         end
 
+        # reset the configuration hash, but do not replace previously auto
+        # determined dependency detection values with nil or 'auto'
         def reset_cache
+          return new_cache unless defined?(@cache) && @cache
+
+          preserved = @cache.select { |_k, v| DEPENDENCY_DETECTION_VALUES.include?(v) }
+          new_cache
+          preserved.each { |k, v| @cache[k] = v unless @cache[k] && @cache[k] != 'auto' }
+          @cache
+        end
+
+        def new_cache
           @cache = Hash.new { |hash, key| hash[key] = self.fetch(key) }
         end
 
         def log_config(direction, source)
           # Just generating this log message (specifically calling