I spent a long span of my career selling and consulting around app performance tools, so what I'm missing as I read this article is - what tools are being used

I spent a long span of my career selling and consulting around app performance tools, so what I'm missing as I read this article is - what tools are being used to measure and aggregate the metrics? I don't see anything in the article I disagree with, other than to say that there are a lot of software tools out there in the market that attempt to take all of these issues into account. So... I'm left wondering if the author has a specific take on why all of those products aren't a good solution?