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DOCS-320 - Log monitor trigger evaluation freq #4305

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DOCS-320 - Log monitor trigger evaluation freq #4305

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23 changes: 23 additions & 0 deletions docs/alerts/monitors/create-monitor.md
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Expand Up @@ -199,6 +199,29 @@ The recovery condition will always be the opposite of the alerting condition. Fo

`Recover automatically when data becomes available for the affected time span.`

**Trigger Evaluation Frequency**

Log monitor triggers are evaluated by balancing the requirement of timely alert notifications while ensuring that monitor data is indeed available to evaluate trigger conditions.

* For static logs monitors, triggers are similar to "Alert when the result is greater than _ within Y Minutes". The triggers are evaluated periodically as below.
| When detection window (Y) is | Evaluate trigger every |
|:-----------------------------|:-----------------------|
| 30m or less | 1m |
| 30m to 3h | 2m |
| 3hr to 12h | 10m |
| Greater than 12h | 20m |
* For outlier logs monitors, triggers are evaluated every 5 minutes.
* For anomaly logs monitors, triggers are evaluated every `timeslice` as specified in the monitor query. For example, the below query is evaluated every 2 minutes.
```
_sourceCategory=Labs/Apache/Access
| timeslice 2m
| parse "HTTP/1.1\" * " as status_code
| if (status_code = "200", 1, 0) as successes
| if (status_code = "404", 1, 0) as fails
| sum(successes) as success_cnt, sum(fails) as fail_cnt by _timeslice
| (fail_cnt/(success_cnt+fail_cnt)) * 100 as failure_rate_pct
```


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