You setup a new website, everything looks good. You were advised to setup a probe to monitor your application. You did, days by days the application works great, you look at your monitoring report , things are normal. One day, you receive an alerts saying your application is not accessible. When you visit your application, it seems fine. Something wrong with the monitoring you setup? It could be , but if you take a deep dive , you see that your application is receiving a huge load from random IPs. You know that there must be something wrong going on, when you review all the logs, you see that there is a bug in your code that allow some people to use your application as a proxy. So the monitoring tools will give you some hints, help you to narrow down the potential issues.