It seems that there is no specific information provided about the Pull Request (PR) for the Thanos project in your request. To create a meaningful summary, I would need details such as:

1. Title of the PR: What is the main objective or feature of the PR?
2. Description: What changes are being proposed? Any relevant context?
3. Files Changed: What parts of the codebase are impacted?
4. Purpose: What issue(s) does it address or what new functionality does it introduce?
5. Related Issues: Any GitHub issues linked to the PR?
6. Testing: What testing has been done, and are there any modifications to existing tests?
7. Impact: Any potential implications on performance, security, compatibility?

If you provide this information, I can generate an advanced-level summary tailored for a developer familiar with the Thanos project.