The DMG has a wealth of information on creating or customising monsters, spells, magic items, races, classes, and backgrounds. It seems to have no information whatsoever about feats.
I've done some digging, but can't seem to find any real information about how to properly go about making homebrew feats for 5e.
I've read Mike Mearls' advice in the UA release of feats, and while it's useful information, it's all pretty broad advice, with none of the depth or mechanical insights of the DMG content.
Is there a source where I can find information like this?