PrometheusRuleFailures #

Meaning #

Prometheus is failing rule evaluations. Prometheus rules are incorrect or failed to calculate.

Impact #

Metrics and alerts may be missing or inaccurate.

Diagnosis #

Your best starting point is the rules page of the Prometheus UI (:9090/rules). It will show the error.

You can also evaluate the rule expression yourself, using the UI, or maybe using PromLens to help debug expression issues.

Mitigation #

Fix rules.