Historically, almost all of Prow’s documentation resided in the kubernetes/test-infra (“k/t-i”) repo. As part of the migration effort, those docs were replaced with “tombstones” in https://github.com/kubernetes/test-infra/pull/27818, with a pointer to this page.
How you can help
The files in this snapshot should probably be reorganized around logical delineations, and not the (inherited) filesystem delineations from k/t-i. This is an ongoing effort and the goal is to one day delete this snapshot altogether (to be replaced by equivalent documentation outside of this folder).