What are some examples of Prometheus alerting rules?

What are some examples of Prometheus alerting rules?

Prometheus alerting rules are used to define conditions under which alerts should be triggered. For example, you can create a rule to alert when CPU usage exceeds a certain threshold.

Can you give me a specific example of an alerting rule?

Sure! Here's a simple example: alert: HighCPUUsage expr: sum(rate(container_cpu_usage_seconds_total[5m])) by (instance) > 0.8 for: 5m labels: severity: critical annotations: summary: 'High CPU usage detected on {{ $labels.instance }}'.

What does the 'for' field mean in that rule?

The 'for' field specifies how long the condition must be true before the alert is triggered. In this case, the CPU usage must be above 80% for 5 minutes.

How can I test these alerting rules?

You can test alerting rules by using the Prometheus web UI to simulate conditions or by deploying them in a staging environment to see if alerts are triggered as expected.