模板化
一般来说,在告警规则文件的 annotations 中使用summary
描述告警的概要信息,description
用于描述告警的详细信息。同时 Alertmanager 的 UI 也会根据这两个标签值,显示告警信息。
为了让告警信息具有更好的可读性,Prometheus 支持模板化 label 和 annotations 的中标签的值。
通过
$labels.<labelname>
变量可以访问当前告警实例中指定标签的值。通过 $value 则可以获取当前 PromQL 表达式计算的样本值。
groups:
- name: example
rules:
# Alert for any instance that is unreachable for >5 minutes.
- alert: InstanceDown
expr: up == 0
for: 5m
labels:
severity: page
annotations:
summary: "Instance {{ $labels.instance }} down"
description: "{{ $labels.instance }} of job {{ $labels.job }} has been down for more than 5 minutes."
# Alert for any instance that has a median request latency >1s.
- alert: APIHighRequestLatency
expr: api_http_request_latencies_second{quantile="0.5"} > 1
for: 10m
annotations:
summary: "High request latency on {{ $labels.instance }}"
description: "{{ $labels.instance }} has a median request latency above 1s (current value: {{ $value }}s)"
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