How to monitor and troubleshoot Fluentd with Prometheus

Fluentd, an open-source data collector commonly used for log aggregation in Kubernetes, can be effectively monitored and troubleshot using Prometheus. The article provides guidance on installing Fluentd with a Helm chart in Kubernetes, enabling necessary Prometheus plugins, and configuring metrics relabelling for improved filtering by namespace, pod, or container. It explains how to analyze both incoming and outgoing records using PromQL queries and addresses common issues such as flush errors, retries, and buffer management. Additionally, it suggests setting alerts for potential problems, like slow flushes or buffer overcapacity, and highlights ready-to-use dashboards for efficient monitoring. The piece concludes by encouraging readers to explore Sysdig Monitor's Managed Prometheus service for enhanced monitoring capabilities.