It seems that the Pull Request (PR) you referenced is undefined or missing specific content. To provide a summary that caters to an advanced developer, I would typically need details such as the nature of the changes, the files affected, related issues or discussions, implementation details, testing methodologies, and any relevant background on the Thanos project.

If you can provide more information about the PR, I could help you summarize that information more effectively. Please provide key details about the Pull Request, and I’ll create a proper summary for you!