Gwern.net was one of the earliest and most consistent gardeners to offer meta-reflections on their work. Each entry comes with:topic tagsstart and end datea stage tag: draft, in progress, or finisheda certainty tag: impossible, unlikely, certain, etc.1-10 importance tagThese are all explained in their website guide, which is worth reading if you're designing your own epistemological system.
I've noticed that Dan Mackinlay has some public notebooks with an interesting system for indicating knowledge process too.