It appears that the details of the Pull Request (PR) for the Thanos project are not provided. To create a meaningful summary, I would need specific information such as:

1. Title of the PR: What the PR is aiming to achieve.
2. Description: An overview of the changes being proposed, including the reasoning behind them.
3. Files Changed: What files are being modified or added, and why they are relevant.
4. Impact: How these changes may affect the current functionality or performance of the Thanos project.
5. Testing: Any tests added or modified, and the testing strategy employed.

With this information, I would be able to compose a comprehensive summary geared towards an advanced developer. If you can provide that, I would be happy to assist!