Setting Up Prometheus and Grafana for Game Server Monitoring on Dedicated Hardware

When your game server starts experiencing lag, tick-rate drops, or crashes, guessing at the root cause wastes hours. Prometheus and Grafana give you real-time visibility into CPU usage, memory pressure, disk I/O, and network performance — all on a single dashboard. This guide walks through setting up a complete monitoring stack for a game server running on dedicated hardware, with alerts that notify you before problems affect your players.

Why Prometheus and Grafana for Game Server Monitoring

Most game server hosts provide basic monitoring — CPU load, RAM usage, and bandwidth graphs. These are not enough to diagnose game server performance issues. You need:

• Per-process metrics: CPU and RAM usage broken down by the game server process, not just the entire machine
• Disk I/O latency: World save latency measured in milliseconds, not just IOPS
• Network jitter: Real-time packet loss and latency variation measurements
• Temperature and throttling: CPU temperature and clock speed to detect thermal throttling

Prometheus collects these metrics at configurable intervals (default 15 seconds), and Grafana visualizes them on dashboards that you can customize for each game server instance.

Installing the Stack

These instructions assume Ubuntu 24.04 LTS on your dedicated server. The same steps work on Debian 12 and CentOS Stream 9 with minor package name changes.

Step 1: Install Prometheus

1. Download the latest Prometheus release: wget https://github.com/prometheus/prometheus/releases/latest/download/prometheus-*.linux-amd64.tar.gz
2. Extract and move binaries: sudo mv prometheus promtool /usr/local/bin/
3. Create a config file at /etc/prometheus/prometheus.yml with scrape targets for the game server process and system metrics
4. Create a systemd service file and start Prometheus on port 9090

Step 2: Install Node Exporter

Node Exporter provides system-level metrics: CPU, memory, disk, network, and temperature.

1. Download and install Node Exporter: wget https://github.com/prometheus/node_exporter/releases/latest/download/node_exporter-*.linux-amd64.tar.gz
2. Run it as a systemd service, listening on port 9100
3. Add localhost:9100 as a scrape target in Prometheus config

Step 3: Custom Game Server Metrics

For game-server-specific metrics — player count, tick rate, RAM allocated to the JVM — create a custom exporter. A simple Python script that reads the game server’s process metrics and exposes them on a Prometheus endpoint works well. The Prometheus process-exporter project can also be used to track per-process CPU and memory usage without custom code.

Step 4: Install and Configure Grafana

1. Install Grafana from the official APT repository: sudo apt install -y grafana
2. Start the Grafana server on port 3000
3. Add Prometheus as a data source in Grafana (URL: http://localhost:9090)
4. Import or create a dashboard for game server monitoring

Key Metrics to Monitor

Metric	Source	Warning Threshold	Critical Threshold
CPU usage (game server process)	process-exporter	> 80% sustained	> 95% sustained
RAM usage (game server process)	process-exporter	> 85% of allocated	> 95% of allocated
Disk write latency	Node Exporter	> 10 ms avg	> 50 ms avg
Network jitter	Node Exporter / custom	> 5 ms	> 15 ms
CPU temperature	Node Exporter (sensors)	> 75°C	> 85°C
Player count	Custom exporter	> 80% of capacity	At capacity
Server tick rate	Custom exporter	Below 90% of target	Below 70% of target

Setting Up Alerts

Grafana alerts can send notifications via Discord, Slack, email, or webhook when thresholds are breached. Configure alerts for:

• High CPU usage: If the game server process uses more than 90% CPU for 5 minutes, send an alert — the server may be approaching capacity.
• Disk latency spikes: If world save latency exceeds 50 ms, check for NVMe throttling or insufficient IOPS.
• Memory pressure: If available RAM drops below 10% of total, players may experience OOM crashes.
• Temperature warnings: If CPU temperature exceeds 85°C, the server may be thermal throttling, reducing performance.

With Prometheus and Grafana in place, you can monitor your game server hosting environment with the same tools that production web services use. The dashboards provide immediate visibility into performance issues, and the alerts ensure you are notified before problems escalate. For any game server running on dedicated hardware, this monitoring stack is the difference between reactive troubleshooting and proactive management.