Merge pull request #566 from tim-seoss/master

Add information on using pre-built / contributed dashboards.

content/docs/visualization/grafana.md

@@ -61,3 +61,14 @@ legend format string `{{method}} - {{status}}`.
 
 The following shows an example Prometheus graph configuration:
 [![Prometheus graph creation](/assets/grafana_qps_graph.png)](/assets/grafana_qps_graph.png)
+
+### Importing pre-built dashboards from Grafana.net
+Grafana.net maintains [a collection of shared dashboards](https://grafana.net/dashboards)
+which can be downloaded and used with standalone instances of Grafana.  Use
+the Grafana.net "Filter" option to browse dashboards for the "Prometheus"
+data source only.
+
+You must currently manually edit the downloaded JSON files and correct the
+`datasource:` entries to reflect the Grafana data source name which you
+chose for your Prometheus server.  Use the "Dashboards" → "Home" → "Import"
+option to import the edited dashboard file into your Grafana install.