I'm sure you have seen it already, but there has been some sound criticism of the DORA metrics: https://isthisit.nz/posts/2022/state-of-the-dora-devops-metr...

Though I disagree with Logan about the change failure rate (see https://two-wrongs.com/you-can-reliably-measure-change-failu...), I still think he is spot on in terms of MTTR.

Strongly seconding Reinertsen for anyone interested in this, though. I think this article of yours is particularly insightful and of high quality: https://lucasfcosta.com/2022/08/31/engineering-metrics.html