It seems that the information provided regarding the Pull Request for the “thanos-io/thanos” project is undefined or missing. To create a meaningful summary, I would need details such as the title of the Pull Request, its purpose, the changes made, any relevant context, and any specific issues it addresses or features it adds.

If you could provide those details or an overview of the Pull Request, I would be happy to help create a summary tailored for an advanced developer!