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docs: document annotations for postgres/mysql

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Daniel Lee
2017-10-24 15:13:04 +02:00
parent f48703502d
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docs/sources/features/datasources/postgres.md
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@ -184,6 +184,29 @@ WHERE $__timeFilter(atimestamp) and hostname in([[hostname]])
ORDER BY atimestamp ASC
```
## Annotations
[Annotations]({{< relref "reference/annotations.md" >}}) allows you to overlay rich event information on top of graphs. You add annotation queries via the Dashboard menu / Annotations view.
An example query:
```sql
SELECT
extract(epoch from time_date_time) AS time,
metric1 as text,
concat_ws(', ', metric1::text, metric2::text) as tags
FROM
public.test_data
WHERE
$__timeFilter(time_date_time)
```
Name | Description
------------ | -------------
time | The name of the date/time field.
text | Event description field.
tags | Optional field name to use for event tags as a comma separated string.
## Alerting
Time series queries should work in alerting conditions. Table formatted queries is not yet supported in alert rule