The metrics/development.ini file is a settings file that defines the Pyramid app and server configuration for the development environment. As happens in most .ini files, the configuration settings are organized in sections. For example, the [server:main] section specifies the value for the listen setting as localhost:6543 to make the waitress server listen on port 6543 and bind it to the localhost address.
This file was included when we created a new app based on a template. Open the metrics/development.ini file and locate the following line that specifies the bool value for the pyramid.debug_routematch setting. The code file for the sample is included in the restful_python_2_09_01 ...
