Monitoring is a crucial aspect of application maintenance, especially in microservices environments. A recent tutorial highlights the importance of monitoring by demonstrating how to instrument custom metrics using Prometheus in a Kubernetes setting. The tutorial covers setting up a Node.js application, deploying it on Kubernetes, and configuring Prometheus for monitoring. Additionally, Alertmanager is set up to receive notifications when issues arise.

Source: https://dev.to/subham_nandi/day-4-custom-metrics-instrumentation-and-scraping-using-prom-client-539b