Especially if there are multiple places to read them from: current dir, PATH, classpath, $PROJECT_HOME, database, env vars... With env vars it would be handy to

Especially if there are multiple places to read them from: current dir, PATH, classpath, $PROJECT_HOME, database, env vars... With env vars it would be handy to also know where they come from, is there a way? like having a timestamp when it was set, by what user and process.