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even though not directly related to platform engineering, see if this helps / this one is more for apps and management teams - <https://www.kaiburr.com/engineering-excellence-2/>

also we have worked with a few platform eng teams for our commercial no code platform (<http://QMCLOUD.io|QMCLOUD.io>) and i can share what they are tracking for KPI"s with infra teams. DM if you think this will be helpful

The latest stuff I read from Nicole Forsgren and others says that you should measure platform team performance via DX surveys. Can't remember if this is the article I read, though: <https://queue.acm.org/detail.cfm?id=3454124>