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28 lines
904 B
Markdown
28 lines
904 B
Markdown
---
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aliases:
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- /docs/grafana/latest/alerting/fundamentals/alert-rules/alert-instances/
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description: Learn about Grafana alert instances
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keywords:
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- grafana
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- alerting
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- instances
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title: Alert instances
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weight: 103
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---
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# Alert instances
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Grafana managed alerts support multi-dimensional alerting. Each alert rule can create multiple alert instances. This is exceptionally powerful if you are observing multiple series in a single expression.
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Consider the following PromQL expression:
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```promql
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sum by(cpu) (
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rate(node_cpu_seconds_total{mode!="idle"}[1m])
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)
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```
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A rule using this expression will create as many alert instances as the amount of CPUs we are observing after the first evaluation, allowing a single rule to report the status of each CPU.
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{{< figure src="/static/img/docs/alerting/unified/multi-dimensional-alert.png" caption="A multi-dimensional Grafana managed alert rule" >}}
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