AlertmanagerClusterDown # Meaning # Half or more of the Alertmanager instances within the same cluster are down. Impact # You have an unstable cluster, if everything goes wrong you will lose the whole cluster. Diagnosis # Verify why pods are not running. You can get a big picture with events. $ kubectl get events --field-selector involvedObject.kind=Pod | grep alertmanager Mitigation # There are no cheap options to mitigate this risk.