It appears that you provided a placeholder (“undefined”) instead of specific details about the Pull Request (PR) for the Thanos project. To create a summary for an advanced developer, I would need more information about the changes proposed in the PR, such as:

1. Title of the PR
2. Description of the Changes: What functionality is being added or modified?
3. Context or Motivation: Why were these changes made? What problem do they solve?
4. Files Affected: What files or components of the Thanos project are being modified?
5. Testing: Are there any tests included or need to be added?
6. Impact: How do these changes affect the overall project or existing features?

If you can provide these details or any specific information related to the PR, I would be happy to help draft a summary!