Alertmanager

A Prometheus exporter converts application or system metrics into a format that Prometheus can scrape. It acts as an adapter between the monitored service and Prometheus.

Grafana Features

• Visualization: Grafana provides several visualization options that make metrics easier to understand.
• Alerting: Grafana can send alerts through email, Slack, Telegram, and other notification channels.

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• Download the Grafana package and place it under /etc.

  bash

  sudo su
  wget https://dl.grafana.com/oss/release/grafana-11.2.2.linux-amd64.tar.gz
  tar -zxvf grafana-v11.2.2.linux-amd64.tar.gz
  cp grafana-v11.2.2.linux-amd64/etc/grafana
  

• Configure Prometheus to use Alertmanager in /etc/prometheusconfig.yml.

  yaml

  alerting:
    alertmanagers:
      - static_configs:
          - targets:
            - IP_ALERT_MANAGER:PORT
  

• Define the rule file that Prometheus will use for alerting in etc/prometheus/config.yml.

  yaml

  rule_files:
  - "FILE_RULES.yml"
  

• Configure Alertmanager's notification destination. This example sends alerts by email. For the full list of supported integrations, see the Prometheus Alertmanager receiver documentation.

  yaml

  global:
    resolve_timeout: 15s
  
  route:
    receiver: email
  
  receivers:
  - name: email
    email_configs:
    - to: "email@test.id"
      from: "email@test.id"
      smarthost: smtp.gmail.com:587
      auth_username: "email@test.id"
      auth_identity: "email@test.id"
      auth_password: "TOKEN_EMAIL"
      send_resolved: True
  

• Define the rules that trigger Alertmanager notifications. The following example covers a stopped Apache or Nginx web server.

  yaml

  groups:
  - name: NAME_RULES
    rules:
    - alert: NAME_ALERT
      expr: METRICS_UNTUK_ALERT
      for: 1m
      annotations:
        summary: "SUMMARY FOR ALERT"
        description: "DESCRIPTIONS FOR ALERT."
  

• Create a systemd service so Alertmanager runs in the background.

  bash

  sudo nano /etc/systemd/system/alert_manager.service
  

  bash

  [Unit]
  Description=Alert Manager
  
  [Service]
  User=root
  ExecStart=/etc/alertmanager/alertmanager \
          --config.file=/etc/alertmanager/config.yml \
          --web.external-url=http://IP_SERVER:9093/ \
          --log.level=debug
  
  [Install]
  WantedBy=default.target
  

• Reload systemd, then start and enable the Alertmanager service.

  bash

  sudo systemctl daemon-reload
  sudo systemctl start alert_manager.service
  sudo systemctl enable alert_manager.service
  sudo systemctl status alert_manager.service