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[ACA] [434939] Update scale up/down step descriptions. #127225

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[ACA] [434939] Update scale up/down step descriptions. #127225

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[ACA] [434939] Update scale up/down step descriptions.
v-jaswel Jun 26, 2025
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Minor edits.
v-jaswel Jun 26, 2025
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14 changes: 7 additions & 7 deletions articles/container-apps/scale-app.md
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Expand Up @@ -6,7 +6,7 @@ author: craigshoemaker
ms.service: azure-container-apps
ms.custom: devx-track-azurecli
ms.topic: conceptual
ms.date: 05/19/2025
ms.date: 06/26/2025
ms.author: cshoe
zone_pivot_groups: arm-azure-cli-portal-bicep
---
Expand Down Expand Up @@ -717,24 +717,24 @@ If you don't create a scale rule, the default scale rule is applied to your cont

## Scale behavior

Scaling behavior has the following defaults:
Scaling has the following behaviors:

| Parameter | Value |
| Behavior | Value |
|--|--|
| Polling interval | 30 seconds |
| Cool down period | 300 seconds |
| Scale up stabilization window | 0 seconds |
| Scale down stabilization window | 300 seconds |
| Scale up step | 1, 4, 100% of current |
| Scale down step | 100% of current |
| Scale up step | 1, 4, 8, 16, 32, ... up to configured maximum replica count |
| Scale down step | 100% of replicas that need to shut down |
| Scaling algorithm | `desiredReplicas = ceil(currentMetricValue / targetMetricValue)` |

- **Polling interval** is how frequently event sources are queried by KEDA. This value doesn't apply to HTTP and TCP scale rules.
- **Cool down period** is how long after the last event was observed before the application scales down to its minimum replica count.
- **Scale up stabilization window** is how long to wait before performing a scale up decision once scale up conditions were met.
- **Scale down stabilization window** is how long to wait before performing a scale down decision once scale down conditions were met.
- **Scale up step** is the rate new instances are added at. It starts with 1, 4, 8, 16, 32, ... up to the configured maximum replica count.
- **Scale down step** is the rate at which replicas are removed. By default 100% of replicas that need to shut down are removed.
- **Scale up step** is how many replicas are added as your container app scales out. It starts at 1, then increases to 4, 8, 16, 32, and so on, up to the configured maximum replica count.
- **Scale down step** is how many replicas are removed as your container app scales in. 100% of replicas that need to shut down are removed.
- **Scaling algorithm** is the formula used to calculate the current desired number of replicas.

### Example
Expand Down