How has it advanced greatly since then?

Most of the tools I’ve been using when my colleagues were writing the book are either gone, or half-forgotten abandonware. The new tools were built for different processes, system layout and organisational structures.

Book barely talks about tools. It wasn't about tools. The epiphany for many was the concept of an error budget and establishing SLOs. Then, basing investment in reliability on data.

That's as applicable today as it was then.

So, what exactly do you propose as an alternative?

What contemporary book do you recommend?