Today I used #bpftrace on a #Linux system to investigate a performance issue. Really took me back to my days working on #Solaris at Sun Microsystems. I used #dtrace quite a bit at that time, and it's good to see the same good ideas thriving in Linux.
I worked in #AIX development at #IBM for many years, and I was always a little sad that people didn't use #probevue more. Perhaps this is because AIX has a good system trace infrastructure and the culture grew up using that. Hard to say.