New ask Hacker News story: Ask HN: New to a system with maintenance in mind and no sparse docs

Ask HN: New to a system with maintenance in mind and no sparse docs
2 by perlpimp | 1 comments on Hacker News.
I have been hired a year ago to work for a company to maintain and update system that we do not have very good documentation for nor do I have insightful knowledge of the tools that are used to maintain and so on. Wonder if there is a good rule of thumb to keep working on the system if there is a lot of time between support requests. Like writing additional tests, interference testing to find patterns of failure and so on to move to deeper understand it.