How to monitor nginx in Kubernetes with Prometheus

The article provides a comprehensive guide on monitoring the open-source web server nginx within a Kubernetes environment using Prometheus. It explains the process of installing the official nginx exporter as a sidecar to expose metrics from nginx server pods, enabling Prometheus to monitor these metrics effectively. Key metrics for monitoring include active connections, unhandled connections, waiting connections, and bytes sent, which can be tracked using Prometheus queries. The article also details how to use Fluentd to extract additional metrics from the nginx access logs, such as error rates and latency, by configuring Fluentd with specific log formats and Prometheus plugins. By leveraging Prometheus and Fluentd, users can gain detailed insights into nginx performance, troubleshoot issues related to latency and saturation, and generate metrics for better data visualization and analysis.