Cloud Intermediate

Prometheus Alerting Rules¶

PrometheusAlertingSRE 3 min read

Konfigurace alertů v Prometheus. PrometheusRule, Alertmanager routing a best practices.

Alert pravidla¶

apiVersion: monitoring.coreos.com/v1
kind: PrometheusRule
metadata:
  name: app-alerts
spec:
  groups:
    - name: app.rules
      rules:
        - alert: HighErrorRate
          expr: rate(http_requests_total{status=~"5.."}[5m]) / rate(http_requests_total[5m]) > 0.05
          for: 5m
          labels: {severity: critical}
          annotations:
            summary: "High error rate ({{ $value | humanizePercentage }})"
        - alert: PodCrashLooping
          expr: rate(kube_pod_container_status_restarts_total[15m]) > 0
          for: 5m
          labels: {severity: warning}

Alertmanager routing¶

route:
  receiver: default
  routes:
    - match: {severity: critical}
      receiver: pagerduty
    - match: {severity: warning}
      receiver: slack
receivers:
  - name: slack
    slack_configs:
      - channel: '#alerts'

Summary¶

Alertujte na symptomy (error rate, latence), ne na příčiny (CPU). Nastavte správné severity a routing.

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