Monitoring RAM Usage with Prometheus Alertmanager and Send Alerts to Discord

In today’s digital landscape, effective monitoring and alerting are critical for ensuring system performance and reliability. Prometheus, paired with Alertmanager, provides a robust framework for monitoring metrics and sending alerts. In this blog, we’ll walk through setting up Prometheus to monitor RAM usage and configuring Alertmanager to send a Discord alert when the RAM usage reaches 60%.

Prerequisites

Before starting, ensure the following are installed and configured:

• Prometheus: For monitoring system metrics.
• Node Exporter: To expose system metrics to Prometheus.
• Alertmanager: To manage and send alerts.
• Discord Webhook URL: For sending alerts to a specific Discord channel.
• Prometheus Alertmanager and Node Exporter are already installed and configured.

Step 1: Monitor RAM Usage with Prometheus

Prometheus requires Node Exporter to collect system-level metrics, including RAM usage.

Refer this blog if Node Exporter is not install : Link

Verify Node Exporter is running by visiting: http://<your_server_ip>:9100/metrics.

Step 2: Set Up Alertmanager for Discord Alerts

Alertmanager handles alerts triggered by Prometheus and can send them to various endpoints.

Configure Alertmanager for Discord

Create a Discord Webhook:

• Open your Discord channel settings.
• Navigate to Integrations > Webhooks > New Webhook.
• Copy the generated Webhook URL.

Edit Alertmanager Configuration: Update alertmanager.yml:

cd /etc/alertmanager
sudo nano /etc/alertmanager/alertmanager.yml

Edit the alertmanager yml file

global:
  resolve_timeout: 5m

receivers:
  - name: "discord-alerts"
    webhook_configs:
      - url: "<your_discord_webhook_url>"

route:
  group_by: ['alertname']
  receiver: "discord-alerts"
  group_wait: 10s
  group_interval: 10s
  repeat_interval: 1h