It seems that the details of the Pull Request (PR) you mentioned are undefined or missing. To create a summary for an advanced developer regarding the Pull Request for the Thanos project, I need additional information about the changes proposed in the PR.

Typically, a PR summary would include:

  1. Title/Description of the PR: A brief but descriptive title that encapsulates the purpose of the changes.
  2. Key Changes: A list of the main changes or features introduced in the PR.
  3. Reasons for the Changes: Explanation of why these changes were made, including any issues they resolve or enhancements they provide.
  4. Impact on the Project: Discussion of how the changes affect the existing functionality or overall performance of the Thanos project.
  5. Testing: Any testing strategies or frameworks used to validate the changes.
  6. Documentation: Information about whether the changes require updates to the documentation and if so, what has been done.

If you provide the details regarding the PR or a specific aspect of it, I can help create a tailored summary.