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ThanosRuleAlertmanagerHighDNSFailures#

This alert is trigerred when Thanos Ruler fails DNS resolution for Alertmanager.

Troubleshooting Hints#

  • Check if Alertmanager is deployed and is running.

    kubectl get pod -n ${NAMESPACE} | grep alertmanager

  • Check the correspondance between Thanos Ruler configuration and how Alertmanager is deployed. The configuration of alertmanagers can be found in a secret:

    kubectl -n ${NAMESPACE} get secret thanosruler-alertmanager-config -o yaml
kubectl -n ${NAMESPACE} get secret thanosruler-alertmanager-config -o jsonpath="{.data.alertmanager-configs\.yaml}" | base64 -d; echo

  • Check the DNS resolution path (coredns...)