To minimize errors in a system, ensuring it is fully tested before going to production is crucial. Application monitoring helps identify the type of error that causes an application to fail, detects potential errors early on, and triggers alerts to notify developers about the error. In this tutorial, you learned how to receive notifications for Prometheus alerts with Spring Boot and Twilio SMS. You set up a Spring Boot project, configured properties files, Prometheus, Alertmanager, and Twilio service, created a custom metric, an alert rule, and a webhook handler. After running the application, you triggered an alert by making multiple requests to the /hello endpoint, which sent a Twilio SMS notification to your phone number. You verified that the alert was received by checking the Alertmanager UI and confirmed that a message was sent using Twilio. By leveraging Prometheus alerts with Spring Boot and Twilio SMS, you can improve system performance and effectiveness by minimizing errors and getting immediate notifications about potential issues.