failed in a previous build. This is essential for Nixpkgs: we don't want to keep doing the same failed dependency (say, Glibc) over and over again for a few hundred jobs.
suffix other than index.html to be declared. E.g. if a build does echo "doc manual $out manual.html" >> $out/nix-support/hydra-build-products the default link for the product is http://localhost:3000/build/417/download/1/manual.html but other files are also accessible, e.g. http://localhost:3000/build/417/download/1/style.css