Given the increasingly complex and distributed nature of modern software, many businesses struggle to meet the growing expectations of their users. Keeping up with identifying and fixing errors and performance issues can make these challenges even tougher. To handle these problems, many companies use application performance monitoring (APM) tools to check the stability of their applications and find any errors. This allows developers to prioritize the problems that need fixing right away. Server-side or infrastructure monitoring looks at the back-end services, while real user monitoring (RUM) focuses on the front-end user experience.