It works for any application running on any collection of computers you have. It teaches you how to discover more about your meters than the documentation reveals. It only requires the simplest math on your part, yet it allows you to easily use fairly advanced techniques. It is relentlessly practical, buzzword free, and written in a conversational style.
Most of the entries in this blog begin with what I put in the book. The book is available from Amazon in paperback and from Apple in iBook format. Both are priced at ~$9 USD. Why so cheap? Because I retired early (mostly due to my computer performance work) and so I wanted to give back what I learned in the hopes that the next generation can do the same.