Alerting Rules in Alert Manager

Now that we have a recording rule, we can build our alerting rule based on this. We know we want to alert when we have less than 75% of our application containers up, so we’ll use the job:uptime:average:ft < .75 expression:

groups:
  - name: uptime
    rules:
      - record: job:uptime:average:ft
        expr: avg without (instance) (up{job="forethought"})
      - alert: ForethoughtApplicationDown
        expr: job:uptime:average:ft < .75
        for: 5m
        labels:
          severity: page
          team: devops
        annotations:
          overview: '{{printf "%.2f" $value}}% instances are up for {{ $labels.job }}'

Notice how we define this rule with alert instead of record and that the name does not have to follow the previously defined format.

Save and exit when done.

Restart Prometheus:
```
 $ sudo systemctl restart prometheus
```
Refresh the Rules page to view the second rule.

Alerting Rules in Alert Manager

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