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articles/azure-monitor/autoscale/autoscale-best-practices.md

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title: Best practices for autoscale
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description: Autoscale patterns in Azure for Web Apps, Virtual Machine Scale sets, and Cloud Services
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ms.topic: conceptual
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ms.date: 04/22/2022
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ms.date: 09/13/2022
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ms.subservice: autoscale
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ms.reviewer: riroloff
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---

articles/azure-monitor/autoscale/autoscale-flapping.md

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In this case, it looks like autoscale isn't working since no scale event takes place. Check the *Run history* tab on the autoscale setting page to see if there's any flapping.
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:::image type="content" source="./media/autoscale-flapping/autoscale-flapping-runhistory-small.png" alt-text="A screenshot showing the autoscale run history tab with records showing flapping" lightbox="./media/autoscale-flapping/autoscale-flapping-runhistory.png":::
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:::image type="content" source="./media/autoscale-flapping/autoscale-flapping-runhistory.png" alt-text="A screenshot showing the autoscale run history tab with records showing flapping" lightbox="./media/autoscale-flapping/autoscale-flapping-runhistory.png":::
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Setting an adequate margin between thresholds avoids the above scenario. For example,
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* Scale out when thread count >=600
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* Scale in when thread count < 400
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:::image type="content" source="./media/autoscale-flapping/autoscale-flapping-example3.png" alt-text="A screenshot showing autoscale rules configured for the example" lightbox:::
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:::image type="content" source="./media/autoscale-flapping/autoscale-flapping-example3.png" alt-text="A screenshot showing autoscale rules configured for the example with scale out when thread count >=600 and scale in when thread count < 400" lightbox:::
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If the scale-in thread count is 400, the total thread count would have to drop to below 1200 before a scale event would take place. See the table below.
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articles/azure-monitor/autoscale/autoscale-get-started.md

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### Cool-down period effects
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Autoscale uses a cool-down period to prevent "flapping," which is the rapid, repetitive up-and-down scaling of instances. For more information, see [Autoscale evaluation steps](autoscale-understanding-settings.md#autoscale-evaluation). For other valuable information on flapping and understanding how to monitor the autoscale engine, see [Autoscale best practices](autoscale-best-practices.md#choose-the-thresholds-carefully-for-all-metric-types) and [Troubleshooting autoscale](autoscale-troubleshoot.md), respectively.
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Autoscale uses a cool-down period to prevent "flapping," which is the rapid, repetitive up-and-down scaling of instances. For more information, see [Autoscale evaluation steps](autoscale-understanding-settings.md#autoscale-evaluation). For other valuable information on flapping and understanding how to monitor the autoscale engine, see [Flapping in Autoscale](azure/azure-monitor/autoscale/autoscale-flapping) and [Troubleshooting autoscale](autoscale-troubleshoot.md), respectively.
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## Route traffic to healthy instances (App Service)
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