Monitoring Node.js Applications has special challenges. The dynamic nature of the language provides many “opportunities” for developers to produce memory leaks, and a single function blocking the event queue can have a huge impact on the overall application performance. Parallel execution of jobs is done using multiple worker processes using the “cluster” functionality to take full advantage of multi-core CPUs – but the master and worker processes belong to a single application, which means that they should be monitored together. Let’s have a deep look at the Top Metrics in Node.js Applications to get a better understanding of why they are so important to monitor.