Linux in 2016 catches up to Solaris from 2004
In 2004 former Reg hack Ashlee Vance brought us news of DTrace, a handy addition to Solaris 10 that "gives administrators thousands upon thousands of ways to check on a system's performance and then tweak ".production boxes with minimal system impact". Vance was excited about the code because "it can help fix problems from the kernel level on up to the user level.""