-Prometheus alert rules allow you to define alert conditions, using queries which are written in Prometheus Query Language (Prom QL) that are applied on Prometheus metrics stored in [Azure Monitor managed services for Prometheus](../essentials/prometheus-metrics-overview.md). Whenever the alert query results in one or more time series meeting the condition, the alert counts as pending for these metric and label sets. A pending alert becomes active after a user-defined period of time during which all the consecutive query evaluations for the respective time series meet the alert condition. Once an alert becomes active, it is fired and would trigger your actions or notifications of choice, as defined in the Azure Action Groups configured in your alert rule.
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