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+title = "KEDA Add-on"
+availability = "v2.20+"
+maintainer = "KEDA"
+category = "Extensibility"
+description = "Scale applications based on KEDA add-on scaler."
++++
+
+### Overview
+
+The KEDA add-on scaler provides a mechanism for KEDA add-ons to manage scaling without requiring users to configure complex external scaler details. Instead of manually specifying `scalerAddress`, metadata, and other configuration, the add-on scaler uses a discovery mechanism where add-ons expose their scaling capabilities through a Custom Resource Definition (CRD).
+
+This approach offers several benefits:
+
+- **Automatic Configuration Discovery**: Add-ons expose their scaling logic through a CRD status, reducing the need for manual configuration
+- **Simplified User Experience**: Users only need to reference an add-on CRD by name and namespace, not internal scaler details
+- **Centralized Configuration**: All add-on scaling configuration lives in one place (the add-on CRD)
+
+> NOTE: This scaler is still experiemtnal
+
+### Trigger Specification
+
+This specification describes the `keda-add-on` trigger for KEDA add-ons.
+
+```yaml
+triggers:
+- type: keda-add-on
+  metadata:
+    name: my-add-on-cr
+    kind: MyAddOnKind
+    apiVersion: my-api-group/v1alpha1
+```
+
+**Parameter list:**
+
+- `name` - The name of the add-on Custom Resource to reference. (Required)
+- `kind` - The kind of the add-on Custom Resource (e.g., `InterceptorRoute`, `HTTPScaledObject`). (Required)
+- `apiVersion` - The API version of the add-on Custom Resource (e.g., `http.keda.sh/v1alpha1`). (Required)
+
+### How It Works
+
+#### Discovery Mechanism
+
+The KEDA add-on scaler follows this process:
+
+1. **Fetch CRD**: The scaler looks up the referenced Custom Resource by name, namespace, kind, and apiVersion when the `ScaledObject|ScaledJob` is created or updated
+2. **Read Status**: The scaler reads the CRD's status field to discover:
+   - The external scaler addres
+   - Scaling metrics information
+   - Default thresholds and target values
+3. **Delegate Scaling**: The scaler uses the discovered information to delegate actual scaling decisions to the add-on's external scaler (via gRPC)
+