Add event entity to Overseerr (#36779)

* Add event entity to Overseerr

* Update source/_integrations/overseerr.markdown

Co-authored-by: c0ffeeca7 <38767475+c0ffeeca7@users.noreply.github.com>

* Update source/_integrations/overseerr.markdown

Co-authored-by: c0ffeeca7 <38767475+c0ffeeca7@users.noreply.github.com>

---------

Co-authored-by: c0ffeeca7 <38767475+c0ffeeca7@users.noreply.github.com>

source/_integrations/overseerr.markdown

@@ -2,19 +2,22 @@
 title: Overseerr
 description: Instructions on how to set up Overseerr with Home Assistant.
 ha_category:
+  - Event
+  - Multimedia
   - Sensor
 ha_release: 2025.2
-ha_iot_class: Local Polling
+ha_iot_class: Local Push
 ha_config_flow: true
 ha_codeowners:
   - '@joostlek'
 ha_domain: overseerr
 ha_integration_type: service
 ha_platforms:
+  - event
   - sensor
 ---
 
-Overseerr is a service that allows you to manage media requests and to integrate those with Plex, Radarr and Sonarr. The **Overseerr** {% term integration %} allows you to see statistics of your [Overseerr](https://overseerr.dev/) instance.
+Overseerr is a service that allows you to manage media requests and to integrate these media requests with Plex, Radarr, and Sonarr. The **Overseerr** {% term integration %} allows you to integrate your [Overseerr](https://overseerr.dev/) instance.
 
 {% include integrations/config_flow.md %}
 
@@ -29,6 +32,44 @@ API key:
     type: string
 {% endconfiguration_basic %}
 
+## Supported functionality
+
+The Overseerr intergation provides a couple of entities to Home Assistant.
+Below is an overview of these entities.
+
+### Events
+
+Overseerr provides an event entity for updates around media.
+The possible events that this entity has are:
+ - `pending`
+ - `approved`
+ - `available`
+ - `failed`
+ - `declined`
+ - `auto_approved`
+
+Relevant data about the request are stored in the attributes.
+
+### Sensors
+
+The integration also provides statistics for the requests stored in Overseerr.
+There are sensors for:
+ - Total requests
+ - Movie requests
+ - TV requests
+ - Pending requests
+ - Declined requests
+ - Processing requests
+ - Available requests
+
+## Data updates
+
+When loading the integration, it will try to configure the webhook in Overseerr to give updates to Home Assistant.
+This makes the integration a push-based integration.
+
+When the integration receives an update about the requests, it updates the statistics to make sure they are up to date.
+In addition, the integration checks for updates every 5 minutes.
+
 ## Remove integration
 
 This integration follows standard integration removal, no extra steps are required.