Include list of effective properties in environment endpoint's response

Currently, EnvironmentEndpoint shows where all of PropertySources are coming from including duplicated keys(overrides) if they are from different sources. (e.g.: one from application.yaml and same key from application-<profile>.yaml)

Usually, while troubleshooting or debugging, what people want to find out is the final value resolved by the Environment.(actual value resolved by @Value("x.y.z") etc.)
Current /env can serve the purpose, but may need to go through several hoops to get the correct answer if there are overrides.

Having final property key-values as part of EnvironmentEndpoint would give clear answer what key-values are used in application.

Such property sources considering override can be obtained like this:

Map<String, Object> map = new HashMap<>();
for (PropertySource<?> propertySource : ((ConfigurableEnvironment) this.environment).getPropertySources()) {
    if (propertySource instanceof EnumerablePropertySource) {
        for (String key : ((EnumerablePropertySource<?>) propertySource).getPropertyNames()) {
            map.putIfAbsent(key, propertySource.getProperty(key));
        }
    }
}
// may sort the map with key...