Love love love obsidian. The tool is aesthetically pleasing, built-in vim mode surprisingly well (a few minor glitches with the cursor blinking) — but above all else, the plug-in community takes the cake. Finally, a note taking application with a decent API that's allowed me to extract metadata and publish metrics into CloudWatch, allowing me to track key metrics and graphically[0] review historical trends of my "sec…
Another metric idea for you: "Time taken after creation to search for and open this note again" This can show how useful your notes are and which are most useful.
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.