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How to Build a Full Log Monitoring Stack with Grafana, Loki, Promtail and Prometheus

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A technical guide outlines how to set up a complete observability stack using four open-source tools: Loki for log storage, Promtail for log collection, Prometheus for metrics scraping, and Grafana for visualization. The entire stack is orchestrated via Docker Compose, with each service defined in a single configuration file and accessible locally through dedicated ports. Promtail is configured to collect logs from WildFly application server directories and forward them to Loki, while Prometheus scrapes metrics from a Spring Boot actuator endpoint at 15-second intervals. Grafana dashboards can then query both data sources to display real-time client status, filter logs for exceptions or specific keywords, and trigger alerts when services go offline for more than five minutes. The guide recommends a minimum of 2–4 vCPUs, 4 GB of RAM, and 10 GB of disk space, and advises using client labels to keep logs and metrics organized across environments.

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