Over at https://github.com/thoughtbot/administrate/pull/2116, Hound is being very noisy about automatically-generated CSS that we can't control.
It looked like the issue could be scss-lint, which is specifically configured in .hound.yml. However I looked up the warning messages and actually they come from stylelint. I have no idea of what configuration of stylelint is being used, but I figured that we can import thoughtbot's one as a baseline. So here it is. Now we have a way to explicitly tell Hound to be silent about specific files.