Use App Service Always On#
Configure Always On for App Service apps.
Azure App Service apps are automatically unloaded when there's no traffic. Unloading apps reduces resource consumption when apps share a single App Services Plan. After an app have been unloaded, the next web request will trigger a cold start of the app.
A cold start of the app can cause a noticeable performance issues and request timeouts.
Continuous WebJobs or WebJobs triggered with a CRON expression must use always on to start.
The Always On feature is implemented by the App Service load balancer, periodically sending requests to the application root.
Consider enabling Always On for each App Services app.