I renamed this chapter to “Perl Debuggers” from “Debugging Perl”; it’s not really about the process of debugging but the tools to do it. Most of it has stayed the same, although I had to remove the unmaintained Devel::ebug::HTTP that uses old Catalyst code. That’s one of the reasons I don’t like tying such modules to frameworks. The people who like to make the frameworks like to reinvent them, leaving all of the legacy code behind.
You can read this chapter in O’Reilly Atlas.