Added examples to the graphs documentation

docs/data-model/extras.md

@@ -90,6 +90,22 @@ NetBox does not have the ability to generate graphs natively, but this feature a
 * **Source URL:** The source of the image to be embedded. The associated object will be available as a template variable named `obj`.
 * **Link URL (optional):** A URL to which the graph will be linked. The associated object will be available as a template variable named `obj`.
 
+## Examples
+
+You only need to define one graph object for each graph you want to include when viewing an object. For example, if you want to include a graph of traffic through an interface over the past five minutes, your graph source might looks like this:
+
+```
+https://my.nms.local/graphs/?node={{ obj.device.name }}&interface={{ obj.name }}&duration=5m
+```
+
+You can define several graphs to provide multiple contexts when viewing an object. For example:
+
+```
+https://my.nms.local/graphs/?type=throughput&node={{ obj.device.name }}&interface={{ obj.name }}&duration=60m
+https://my.nms.local/graphs/?type=throughput&node={{ obj.device.name }}&interface={{ obj.name }}&duration=24h
+https://my.nms.local/graphs/?type=errors&node={{ obj.device.name }}&interface={{ obj.name }}&duration=60m
+```
+
 # Topology Maps
 
 NetBox can generate simple topology maps from the physical network connections recorded in its database. First, you'll need to create a topology map definition under the admin UI at Extras > Topology Maps.