# File lib/new_relic/agent/configuration/manager.rb, line 325
        def reset_to_defaults
          @high_security_source = nil
          @environment_source   = EnvironmentSource.new
          @server_source        = nil
          @manual_source        = nil
          @yaml_source          = nil
          @default_source       = DefaultSource.new

          @configs_for_testing  = []

          reset_cache
        end