While upgrading profiler docs to Symfony 4 (symfony/symfony-docs#8685) it was strange to see the profiler.dsn config. In the past this made sense because profiler data could be saved in Redis, databases, etc. But now you can only save it in files, so this is not a DSN but a simple directory path.

This is a very unimportant option ... but maybe we can update its name to be more appropriate.