In order to use ruff: do I need to install ruff manually? If not where is it installed?

[ardabro]

I didn't installed ruff, and I don't see it listed by pip3.
But when turned on I'm getting some (not many) complaints about code formatting, like unused variables, too long line etc.
with ruff issue ID like: ruff(F841).
I'm trying to understand what is going on here.
Where is the ruff? How can I configure it (add exemptions, etc...). Or maybe these messages don't come from ruff?

[Rafał Chłodnicki]

The package creates a virtual environment in package storage with all required packages installed there. It doesn't affect your global python.

You configure stuff through LSP-pylsp settings or through linter's own configuration files per linter's documentation.