Indeed, I'd never heard of Metal before reading this post. The quote you included is what lead me to wonder why there are not better tools for such a popular development framework as Ruby on Rails.
As that quote states, there doesn't appear to be a profiler as such, but rather a set of "timing and logging components" built into the framework. If it's true, then ruby today is essentially handling profiling the same way PHP did it in 1998. I find that surprising and saddening.
Also, what is the way PHP handles profiling in 2009 ? I haven't developed in php in quite a while, and I admit I never used anything more complicated then the profiling tools built in Zend Studio.
As that quote states, there doesn't appear to be a profiler as such, but rather a set of "timing and logging components" built into the framework. If it's true, then ruby today is essentially handling profiling the same way PHP did it in 1998. I find that surprising and saddening.