How do you organize a monitoring system for applications or infrastructure?

To organize a system for monitoring applications and infrastructure, I usually use the following approach:

1. Defining metrics and logs — selecting key performance indicators (CPU, memory, response time, errors) and application logs.

2. Data collection — installing monitoring agents (e.g., Prometheus Node Exporter, Telegraf) to gather metrics and logs.

3. Storage and visualization — using metric storage systems (Prometheus, InfluxDB) and dashboards (Grafana) to visualize the state.

4. Alert configuration — setting alert rules for critical thresholds (e.g., via Alertmanager).

5. Integration with notification systems — connecting notifications to Slack, email, PagerDuty.

6. Regular analysis and improvement — analyzing incidents and adjusting metrics and alerts.

Example of using Prometheus and Grafana:

# Example Prometheus configuration for collecting metrics from Node Exporter
scrape_configs:
  - job_name: 'node'
    static_configs:
      - targets: ['localhost:9100']

This approach allows for quick problem detection and maintaining service stability.