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grafana/docs/sources/alerting/fundamentals/alert-rules/alert-instances.md
brendamuir 4d375aa5d4 Alerting docs: Adds Alerting descriptions for fundamentals section (#79383) 
Adds Alerting descriptions for fundamentals section
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https://grafana.com/docs/grafana/latest/alerting/fundamentals/alert-rules/alert-instances/ Learn about alert instances
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alerting
instances
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cloud
enterprise
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Alert instances 105

Alert instances

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.

Consider the following PromQL expression:

sum by(cpu) (
  rate(node_cpu_seconds_total{mode!="idle"}[1m])
)

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.

{{< figure src="/static/img/docs/alerting/unified/multi-dimensional-alert.png" caption="A multi-dimensional Grafana managed alert rule" >}}