Your web app is connected to a databases or legacy system, which may not scale as fast as the web app.You want your web apps within the same App Service Plan to scale differently and independently of each other.You don't want to set up autoscale rules based on resource metrics.Here are a few scenarios where you should scale out automatically: Resources may be shared when multiple web apps within an App Service Plan are required to scale out simultaneously. As your web app starts receiving HTTP traffic, App Service monitors the load and adds instances. You enable automatic scaling for an App Service Plan and configure a range of instances for each of the web apps. No, your web app runs on other instances available during the scale out operation, based on threshold defined for autoscale rules. No, your web app runs on the number of manually scaled instances. No, the platform manages the scale out and in based on HTTP traffic. You're charged per second for every instance, including prewarmed instances.Ī comparison of scale out and scale in options available on App Service: You can use Application Insights Live Metrics to check your current instance count, and performanceCounters to see the instance count history. The platform prewarms instances to act as a buffer when scaling out, ensuring smooth performance transitions. With automatic scaling, you can adjust scaling settings to improve your app's performance and avoid cold start issues. It's different from the pre-existing Azure autoscale, which lets you define scaling rules based on schedules and resources. It's available for Premium Pv2 and Pv3 pricing tiers, and supported for all app types: Windows, Linux, and Windows container.Īutomatic scaling is a new scale out option that automatically handles scaling decisions for your web apps and App Service Plans.
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