GeoNet NZ Quakes Sensor (#10229)

* documents sensor

* ✏️ Tweak

source/_components/geonetnz_quakes.markdown

@@ -37,7 +37,6 @@ We acknowledge the New Zealand GeoNet project and its sponsors EQC, GNS Science
 
 </div>
 
-
 ## Configuration
 
 To integrate the GeoNet New Zealand Quakes feed use the "Integrations" feature 
@@ -77,7 +76,6 @@ longitude:
   default: Longitude defined in your configuration.
 {% endconfiguration %}
 
-
 ## State Attributes
 
 The following state attributes are available for each entity in addition to 
@@ -101,6 +99,26 @@ Please note that the reported MMI may be lower than the minimum requested MMI.
 This integration is passing the requested MMI value to the feed source and 
 displays all entries retrieved without further filtering by MMI.
 
+## Sensor
+
+This integration automatically creates a sensor that shows how many entities
+are currently managed by this integration. In addition to that the sensor has
+some useful attributes that indicate the currentness of the data retrieved
+from the feed.
+
+<p class='img'>
+  <img src='{{site_root}}/images/screenshots/geonetnz-quakes-sensor.png' />
+</p>
+
+| Attribute              | Description |
+|------------------------|-------------|
+| status                 | Status of last update from the feed ("OK" or "ERROR").  |
+| last update            | Timestamp of the last update from the feed.  |
+| last update successful | Timestamp of the last successful update from the feed.  |
+| last timestamp         | Timestamp of the latest entry from the feed.  |
+| created                | Number of entities that were created during last update (optional).  |
+| updated                | Number of entities that were updated during last update (optional).  |
+| removed                | Number of entities that were removed during last update (optional).  |
 
 ## Full Configuration