Work-search log: how detailed does it need to be? - any advice?

I have been applying to about 14 jobs a week as a mechanic, but I am unsure what my state wants in the log. I do not usually post, so bear with me. I also did a résumé workshop at the library. What do you record?

I was asked for my log once, after six months. Having it in a spreadsheet made it painless.