📌 Overview Prometheus Node Exporter provides excellent system-level metrics, but in real-world production environments, we often need custom application metrics  — for example: Postfix mail queue size Service status running/failure Application health Queue depth In this blog, we will implement a custom Node Exporter metric  to monitor postfix mail queue and visualise it in Grafana , using the textfile collector,  the recommended and production-safe approach. 🧠 Architecture

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