It seems that the Pull Request you mentioned is undefined, meaning there are no details available for me to summarize. Typically, a Pull Request (PR) in a project like thanos-io/thanos would involve code changes intended to improve, fix, or enhance the functionality of the Thanos project.

To create a detailed summary, please provide relevant details such as the PR title, description, key changes, and any associated issues or discussions. This information will allow me to generate a meaningful summary tailored for an advanced developer.