Did you hear people saying “If there is no existing Prometheus exporter to cover your use case, you can easily build one yourself”? And now you are running Prometheus, monitor your infrastructure with it and have some component that can’t be monitored with an existing exporter? So what did these people mean by “easily build one yourself”? Where do you start? How does it work? Let’s dive in and build our own Prometheus exporter in 45 minutes.