Project Auditor Rules package
Project Auditor is a static analysis tool for Unity projects that is built in to the Unity Editor. This package contains the rules that Project Auditor uses as the basis for recommending improvements to a project. You don't have to interact with this package other than installing it as a dependency of Project Auditor.
Installation
To launch Project Auditor in the Editor, go to Window > Analysis > Project Auditor. On launch, Project Auditor prompts you to install this package before it can analyze your project.
Click the following link to open the Editor and install the Project Auditor Rules package directly: Open the Unity Editor and install the Project Auditor Rules.
Alternatively, follow the instructions in the Add and remove UPM packages or feature sets documentation. You can install the package using the package registry list, or by using com.unity.project-auditor-rules as the name when adding a registry package by name.