docs(datasource): add root datasource page

docs/sources/datasources/index.md

@@ -8,4 +8,24 @@ parent = "features"
 weight = 5
 +++
 
+# Data Source Overview
+Grafana supports many different storage backends for your time series data (Data Source). Each Data Source has a specific Query Editor that is customized for the features and capabilities that the particular Data Source exposes.
+
+
+## Querying
+The query language and capabilities of each Data Source are obviously very different. You can combine data from multiple Data Sources onto a single Dashboard, but each Panel is tied to a specific Data Source that belongs to a particular Organization.
+
+## Supported Data Sources
+The following datasources are officially supported:
+
+* [Graphite](/datasources/graphite/)
+* [Elasticsearch](/datasources/elasticsearch/)
+* [CloudWatch](/datasources/cloudwatch/)
+* [InfluxDB](/datasources/influxdb/)
+* [OpenTSDB](/datasources/opentsdb/)
+* [Prometheus](/datasources/prometheus)
+
+## Data source plugins
+
+Since grafana 3.0 you can install data sources as plugins. Checkout [Grafana.net](https://grafana.net/plugins) for more data sources.
 

docs/sources/datasources/overview.md

-----
-page_title: Data Source Overview
-page_description: Data Source Overview
-page_keywords: grafana, graphite, influxDB, KairosDB, OpenTSDB, Prometheus, documentation
----
-
-# Data Source Overview
-Grafana supports many different storage backends for your time series data (Data Source). Each Data Source has a specific Query Editor that is customized for the features and capabilities that the particular Data Source exposes.
-
-
-## Querying
-The query language and capabilities of each Data Source are obviously very different. You can combine data from multiple Data Sources onto a single Dashboard, but each Panel is tied to a specific Data Source that belongs to a particular Organization.
-
-## Supported Data Sources
-The following datasources are officially supported:
-
-* [Graphite](/datasources/graphite/)
-* [Elasticsearch](/datasources/elasticsearch/)
-* [CloudWatch](/datasources/cloudwatch/)
-* [InfluxDB](/datasources/influxdb/)
-* [OpenTSDB](/datasources/opentsdb/)
-* [KairosDB](/datasources/kairosdb)
-* [Prometheus](/datasources/prometheus)
-
-Grafana can query any Elasticsearch index for annotation events, but at this time, it's not supported for metric queries. Learn more about [annotations](/reference/annotations/#elasticsearch-annotations)