Prometheus Not Connected To Alertmanagers

PrometheusNotConnectedToAlertmanagers #

Meaning #

Prometheus is not connected to any Alertmanagers.

Impact #

Sending alerts is not possible.

Diagnosis #

Check connectivity issues between Prometheus and AlertManager. Check NetworkPolicies, network saturation. Check if AlertManager is not overloaded or has not enough resources.

Mitigation #

Set multiple AlertManager instances, spread them across nodes.