@Jason Tucker - Hey there! At one of my old gigs we would allocate based on zSeries vs iSeries, apply different overall weightings for different operating companies based on their annual spend, and also have allocations for app matches and non-match, but nothing specifically on OS. I do remember having to filter mainframe out of our CMDB data (to separate servers from mainframe) and would use OS to help with that, though. Hoping someone has done what you're asking and can hop on and give their feedback - looking forward to responses! Hope you're doing well! ππ±βπ€
#ApptioforAll