Rules vs Alerts

[Cemalettin Koc]

What is the difference with Rules and Alerts. In the documentation I can see that

# Rule files specifies a list of globs. Rules and alerts are read from
# all matching files.

In the documentation of "alerting rules", almost all paragraphs are including words of "alerting rules". So what are "rules" and "alerts" implying? For alerts: alerting rules, and for rules: "recording rules" ? 

Thanks

[Ben Kochie]

Rules files contain two basic kinds of configurations.

Recording rules[0], and alerts[1].

Recording rules allow you to transform a query into a new set of metrics;

# The count of CPUs per node, useful for getting CPU time as a percent of total.
instance:node_cpus:count = count(node_cpu{mode="idle"}) without (cpu,mode)

Alerting rules create alert messages that can be routed through the alert manager.

ALERT InstanceIsDown

  IF up == 0

  FOR 5m

  LABELS {

    severity = "critical"

  }

  ANNOTATIONS {

    summary = "An instance is down"

    description = ""{{$labels.job}} on {{$labels.instance}} is down"

}

[0]: https://github.com/prometheus/node_exporter/blob/master/example.rules

[1]: https://github.com/prometheus/mysqld_exporter/blob/master/example.rules

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[Cemalettin Koc]

I would go to separate these files by contextual meanings. I mean for etcd, kubernetes components, database etc.. I will use separate files. This makes much more sense for me. This will also help me to reuse these files.

Thanks for clarification. 

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[Ben Kochie]

The current implementation evaluates all rules from all files with a single timer, so the organization of what goes in which file is left entirely up to the user.

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