How do I configure alerts in Prometheus?

How do I configure alerts in Prometheus?

To configure alerts in Prometheus, you need to define alerting rules in your configuration file. Would you like a step-by-step guide?

Yes, please provide the steps.

First, create a file named alert.rules.yml. Then, define your alert rules using the following structure:

groups:
- name: example-alerts
  rules:
  - alert: HighCPUUsage
    expr: sum(rate(cpu_usage[5m])) by (instance) > 0.9
    for: 5m
    labels:
      severity: critical
    annotations:
      summary: "High CPU usage detected on {{ $labels.instance }}"

After that, update your prometheus.yml to include this rules file.

What should I do after updating the configuration?

After updating the configuration, restart Prometheus to apply the changes. You can check the alerts in the Prometheus UI under the 'Alerts' section.