What are some examples of alerting in Prometheus?
Prometheus alerting can be set up using Alertmanager. For example, you can create alerts for high CPU usage or low disk space.
Can you give me a specific alert rule for high CPU usage?
Sure! An example alert rule for high CPU usage could be:
- alert: HighCpuUsage
expr: sum(rate(container_cpu_usage_seconds_total[5m])) by (instance) > 0.9
for: 5m
labels:
severity: critical
annotations:
summary: "High CPU usage detected on {{ $labels.instance }}"
description: "CPU usage is above 90% for more than 5 minutes."
What happens when an alert is triggered?
When an alert is triggered, Alertmanager sends notifications to configured receivers, such as email, Slack, or PagerDuty.
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