It seems there is no specific information provided about the Pull Request (PR) in the Thanos project, as it is labeled “undefined.” To create a meaningful summary for an advanced developer, I would need details such as the title, description, changes made, the purpose of the PR, any related issues or discussions, and any implications for the project.

Typically, a summary for a PR would include the following:

1. Purpose: What is the main goal of the PR?
2. Changes: A brief overview of the main changes implemented.
3. Context: Any background information necessary for understanding the changes.
4. Testing: Information on any tests added or modified.
5. Impact: How these changes affect the project or users.
6. Related Issues: Any linked issues or features.

If you can provide these details or clarify the content of the Pull Request, I would be happy to help you craft a comprehensive summary!