Updated influxdb docs, adding docs specific to influxdb 0.9, #2270

docs/sources/datasources/influxdb.md

@@ -4,10 +4,11 @@ page_description: InfluxDB query guide
 page_keywords: grafana, influxdb, metrics, query, documentation
 ---
 
-
 # InfluxDB
 
-There are currently two separate datasources for InfluxDB in Grafana: InfluxDB 0.8.x and InfluxDB 0.9.x. The API and capabilities of InfluxDB 0.9.x are completely different from InfluxDB 0.8.x. InfluxDB 0.9.x data source support is provided on an experimental basis.
+There are currently two separate datasources for InfluxDB in Grafana: InfluxDB 0.8.x and InfluxDB 0.9.x.
+The API and capabilities of InfluxDB 0.9.x are completely different from InfluxDB 0.8.x which is why Grafana handles
+them as different data sources.
 
 ## Adding the data source to Grafana
 Open the side menu by clicking the the Grafana icon in the top header. In the side menu under the `Dashboards` link you
@@ -31,32 +32,66 @@ Password | Database user's password
 > *Note* When using Proxy access mode the InfluxDB database, user and password will be hidden from the browser/frontend. When
 > using direct access mode all users will be able to see the database user & password.
 
-## InfluxDB 0.9.x query editor
+## InfluxDB 0.9.x
 
-This editor & data source is not compatible with InfluxDB 0.8.x, please use the right data source for you InfluxDB version.
-The InfluxDB 0.9.x editor is currently under development and is not yet fully usable.
+![](/img/influxdb/InfluxDB_09_editor.png)
 
-## InfluxDB 0.8.x query editor
+You find the InfluxDB editor in the metrics tab in Graph or Singlestat panel's edit mode. You enter edit mode by clicking the
+panel title, then edit. The editor allows you to select metrics and tags.
 
-![](/img/v1/influxdb_editor.png)
+### Editor tag filters
+To add a tag filter click the plus icon to the right of the `WHERE` condition. You can remove tag filters by clicking on
+the tag key and select `--remove tag filter--`.
+
+### Editor group by
+To group by a tag click the plus icon after the `GROUP BY ($interval)` text. Pick a tag from the dropdown that appears.
+You can remove the group by by clicking on the tag and then select `--remove group by--` from the dropdown.
+
+### Editor RAW Query
+You can switch to raw query mode by pressing the pen icon.
 
-When you add an InfluxDB query you can specify series name (can be regex), value column and a function. Group by time can be specified or if left blank will be automatically set depending on how long the current time span is. It will translate to a InfluxDB query that looks like this:
+> If you use Raw Query be sure your query at minimum have `WHERE $timeFilter` clause and ends with `order by asc`.
+> Also please always have a group by time and an aggregation function, otherwise InfluxDB can easily return hundreds of thousands
+> of data points that will hang the browser.
 
+### Alias patterns
+
+- $m = replaced with measurement name
+- $measurement = replaced with measurement name
+- $tag_hostname = replaced with the value of the hostname tag
+- You can also use [[tag_hostname]] pattern replacement syntax
+
+### Templating
+You can create a template variable in Grafana and have that variable filled with values from any InfluxDB metric exploration query.
+You can then use this variable in your InfluxDB metric queries.
+
+For example you can have a variable that contains all values for tag `hostname` if you specify a query like this
+in the templating edit view.
 ```sql
-select [[func]]([[column]]) from [[series]] where [[timeFilter]] group by time([[interval]]) order asc
+SHOW TAG VALUES WITH KEY = "hostname"
 ```
 
-To write the complete query yourself click the cog wheel icon to the right and select ``Raw query mode``.
+You can also create nested variables. For example if you had another variable, for example `region`. Then you could have
+the hosts variable only show hosts from the current selected region with a query like this:
 
-## InfluxDB 0.9 Filters & Templates queries
+```sql
+SHOW TAG VALUES WITH KEY = "hostname"  WHERE region =~ /$region/
+```
+
+> Always you `regex values` or `regex wildcard` for All format or multi select format.
+
+![](/img/influxdb/templating_simple_ex1.png)
+
+### Annotations
 
-The InfluxDB 0.9 data source does not currently support filters or templates.
+### InfluxDB 0.8.x
+
+![](/img/v1/influxdb_editor.png)
 
 ## InfluxDB 0.8 Filters & Templated queries
 
 ![](/img/animated_gifs/influxdb_templated_query.gif)
 
-
 Use a distinct influxdb query in the filter query input box:
 
 ```sql