Comment by bluGill

The problem is until I hit a specific bug I don't know what logs might be useful. For every bug I've had to fix 99% of the logs were useless, but I've had to fix many bugs over the years and each one needed a different set of logs. Sometimes I know in the code "this can't happen but I'll log an error just in case" - when I see those in a bug report they are often a clue, but I often need a lot of info bugs that happen normally all the time to figure out how my system got into that state.

"disk getting full" isn't useful unless you understand how/why it got full and that requires logging things that might or might matter to the problem.