Hi,
clang-tidy saves a YAML report when the option '-export-fixes=...> is used.
Adding the check id sounds like a useful feature.
I made a patch which adds check ID and filed a bug (See the patch there). I hope it can be reviewed and applied soon, because it will be really useful to be able to group and filter results after clang-tidy did his work.
Could you send the patch via LLVM Phabricator, please? It’s the preferred way to send clang-tidy patches.