Whether you're a developer building websites or internal applications, or an administrator building the infrastructure to back them, your job doesn't stop once they're up and running. Machine failure, releases containing bugs, and growth in usage can all lead to problems that need to be dealt with. To detect them, you need monitoring.

But monitoring can do more than just send you alerts about the things that are going wrong. It can also help you debug those problems and prevent them in the future. So what things should you be monitoring?