feat: Introduce activationThreshold/minMetricValue for Kubernetes Wor…

…kload Scaler

Signed-off-by: Jorge Turrado <jorge_turrado@hotmail.es>

content/docs/2.8/scalers/kubernetes-workload.md

@@ -15,12 +15,14 @@ triggers:
   metadata:
     podSelector: 'app=backend'
     value: '0.5'
+    activationValue: '3.1'
 ```
 
 **Parameter list:**
 
 - `podSelector` - [Label selector](https://kubernetes.io/docs/concepts/overview/working-with-objects/labels/#label-selectors) that will be used to get the pod count. It supports multiple selectors split by a comma character (`,`). It also supports [set-based requirements](https://kubernetes.io/docs/concepts/overview/working-with-objects/labels/#set-based-requirement) and a mix of them.
 - `value` - Target relation between the scaled workload and the amount of pods which matches the selector. It will be calculated following this formula: `relation = (pods which match selector) / (scaled workload pods)`. (This value can be a float)
+- `activationValue` - Target value for activating the scaler. Learn more about activation [here](./../concepts/scaling-deployments.md#activating-and-scaling-thresholds).(Default: `0`, Optional, This value can be a float)
 
 > 💡 **Note:** The search scope is limited to the namespace where the `ScaledObject` is deployed.