[dontlaugh]

I think it was Chubby they did that with.

[riv991]

It was, they talk about it here: https://sre.google/sre-book/service-level-objectives/

[eru]

Thanks for giving the source!

In my defense, by being so vague, I can't accidentally reveal company secrets. (I used to work as an SRE for Google Photos for a while.)