How to monitor Nginx on Kubernetes: Metrics alerts

Monitoring Nginx on Kubernetes effectively requires setting up specific alerts to handle common failure points and service degradation scenarios. The article outlines the process of configuring these alerts, starting from the foundational monitoring practices discussed in a previous post, which include using Nginx stub_stats module and Kubernetes metadata labels to track metrics like active connections and response times. It emphasizes the importance of alerting for critical issues such as Nginx pods failing to run, which might be indicated by metrics like kubernetes.replicaSet.replicas.running, and scenarios like CrashLoopBackOff due to misconfigurations. The text also highlights the use of Sysdig Monitor for advanced alerting and troubleshooting, allowing users to detect issues such as dropped connections, service quality degradation, and HTTP error codes without additional code instrumentation. By leveraging a combination of system metrics, HTTP parameters, and orchestrator-level information, the article presents a flexible approach to maintaining Nginx performance and availability in a Kubernetes environment.