Unable to connect to database SQLSTATE[HY000] [1045] Access denied for user 'librenms'@'localhost' (using password: NO)

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The docs are not super clear (pull request welcome), but;

Final steps

That’s it! You now should be able to log in to http://librenms.example.com/

you need to do that, it will then setup your database, and configure the .env file