What are Prometheus alert rules and how do I create them?
Prometheus alert rules are configurations that define conditions under which alerts should be triggered. You create them in a YAML file.
Can you give me an example of a simple alert rule?
Sure! A simple alert rule could look like this: alert: HighCPUUsage expr: sum(rate(cpu_usage_seconds_total[5m])) by (instance) > 0.9 for: 5m labels: severity: critical annotations: summary: 'High CPU usage detected on {{ $labels.instance }}'
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How do I test if my alert rules are working?
You can test your alert rules by using the Prometheus web UI to simulate conditions that would trigger the alerts.
What should I do if my alerts are not firing?
If your alerts are not firing, check the alert rule syntax, ensure the Prometheus server is scraping the metrics, and verify the alerting configuration.
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