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I think one is a portal for GitHub developers, while the other is a public polished site. I reminisced the early Google forthright attitude that made life so simple and human.
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The readme at https://github.com/google/building-secure-and-reliable-syste... does say this book is found there, and sure enough it's the first one on the list: https://google.github.io/building-secure-and-reliable-system...

It seems this github.io URL is more like a CI run of the book, and the one on sre.google is the "published" one.

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sre.google links to this book, but it links to github.io. The other two books linked on sre.google point to within the sre.google domain, so this is the odd one out.
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