docs: document annotations for postgres/mysql

docs/sources/features/datasources/index.md

@@ -28,8 +28,9 @@ The following datasources are officially supported:
 * [InfluxDB]({{< relref "influxdb.md" >}})
 * [OpenTSDB]({{< relref "opentsdb.md" >}})
 * [Prometheus]({{< relref "prometheus.md" >}})
+* [MySQL]({{< relref "mysql.md" >}})
+* [Postgres]({{< relref "postgres.md" >}})
 
 ## Data source plugins
 
 Since grafana 3.0 you can install data sources as plugins. Checkout [Grafana.net](https://grafana.com/plugins) for more data sources.
-

docs/sources/features/datasources/influxdb.md

@@ -173,6 +173,4 @@ SELECT title, description from events WHERE $timeFilter order asc
 
 For InfluxDB you need to enter a query like in the above example. You need to have the ```where $timeFilter```
 part. If you only select one column you will not need to enter anything in the column mapping fields. The
-Tags field can be a comma seperated string.
-
-
+Tags field can be a comma separated string.

docs/sources/features/datasources/mysql.md

@@ -174,7 +174,28 @@ 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
+  UNIX_TIMESTAMP(atimestamp) as time_sec,
+  value as text,
+  CONCAT(tag1, ',', tag2) as tags
+FROM my_table
+WHERE $__timeFilter(atimestamp)
+ORDER BY atimestamp ASC
+```
+
+Name | Description
+------------ | -------------
+time_sec | 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
-conditions.
+Time series queries should work in alerting conditions. Table formatted queries is not yet supported in alert rule conditions.

docs/sources/features/datasources/postgres.md

@@ -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

docs/sources/reference/annotations.md

@@ -69,5 +69,5 @@ The annotation query options are different for each data source.
 - [Elasticsearch annotation queries]({{< relref "features/datasources/elasticsearch.md#annotations" >}})
 - [InfluxDB annotation queries]({{< relref "features/datasources/influxdb.md#annotations" >}})
 - [Prometheus annotation queries]({{< relref "features/datasources/prometheus.md#annotations" >}})
-
-
+- [MySQL annotation queries]({{< relref "features/datasources/mysql.md#annotations" >}})
+- [Postgres annotation queries]({{< relref "features/datasources/postgres.md#annotations" >}})