Alerting rules allow you to define alert conditions based on Prometheus Quey Language (PromQL) expressions and to send notifications about firing alerts to an external service. Whenever the alert expression results in one or more vector elements at a given point in time, the alert counts as active for these elements' label sets. If you have installed Prometheus with Helm, you have yet a Custom Resource Definitions (CRD) called PrometheusRule. Below is an example
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