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How would you add text from the instance label to the alert's description for the following alert? alert: InstanceDown expr: up == 0 for: 5m labels: severity: page annotations: description: "Instance INSTANCE_NAME_HERE down"
Correct Answer: A
In Prometheus alerting rules, you can dynamically reference label values in annotations and labels using template variables. Each alert has access to its labels via the variable $labels, which allows direct insertion of label data into alert messages or descriptions. To include the value of the instance label dynamically in the description, replace the placeholder INSTANCE_NAME_HERE with: description: "Instance {{$labels.instance}} down" or equivalently: description: "Instance $labels.instance down" Both forms are valid - the first follows Go templating syntax and is the recommended format. This ensures that when the alert fires, the instance label (e.g., a hostname or IP) is automatically included in the message, producing outputs like: Instance 192.168.1.15:9100 down Options B, C, and D are invalid because $value, $expr, and $metric are not recognized context variables in alert templates. Reference: Verified from Prometheus documentation - Alerting Rules Configuration, Using Template Variables in Annotations and Labels, and Prometheus Templating Guide (Go Templates and $labels usage) sections.
