It looks like the details of the Pull Request (PR) for the Thanos project are undefined or missing. To create an effective summary, I would need specific information regarding the PR, such as:

• The title of the PR
• The description or purpose of the changes
• Key features or enhancements introduced
• Any bug fixes addressed
• Impact on existing code, such as breaking changes or deprecations
• Related issues or discussions in the project’s repository
• Relevant tests added or modified
• Any additional comments or considerations made by the author or reviewers

If you provide any of that information, I can help construct a detailed summary tailored for advanced developers.