I have a database I wrote many years ago and I have put a comment field in just for this type of thing. I will usually give a basic description of the ride and always make sure to put down anything that way outside the norm happing. Like when I had a 2 inch bolt go through my 5 month old rim, that seemed notable. I have every ride since 2006 in this database with various metrics and such. I am a data geek by profession, so why not have a database for my ride, bike, and maintenance data.