Once you’ve already learned the ins and outs of a library, it may seem obvious how it should be used (and which parts should be avoided). The thing is that, from one project to the next, we often make use of new and different libraries and frameworks and may not appreciate some of the more subtle differences among those technologies.
The better frameworks out there will log all kinds of information, often telling you when you’re using them incorrectly. So don’t just think of log files as something only relevant for production. There are nuggets in there that can really help you in development as well.
Look at your log files at regular intervals. Doing that from time to time and, even better, automating it, can save you from headaches even before you release your products into production. Eventually, this practice will not only prevent bugs but it can also dramatically improve performance in certain cases.
If you want to know how this story goes on, I suggest you read the full blog post originally posted on the particular blog.