> how useful your notes are

While I think it's an interesting metric, it wouldn't capture the utility of my notes for me (emphasis on "for me", since everyone's probably different when it comes to notes).

Often, the act of writing the note helps better commit what I'm writing to memory. At a super rough estimate I'd say that 80% of the utility of note-taking is the act of producing the note itself, and only 20% of the utility is being able to refer back to specific facts.

I used to set this manually on Tiddlywiki with a "touched" field. I'm thinking of incorporating this into Obsidian using the templater plugin.

I found it very useful to organize research papers like this.

Would be interesting to see how to capture this metric within Obsidian. I can imagine a similar metric: "elapsed time between note created and first time note opened." This data might help answer whether or not we are creating notes that are never revisited, an opportunity to purge the note itself.