If your Azure App Service is receiving more requests than it can handle, requests will begin to get backed up in the application queue. Blue Matador automatically watches the RequestsInApplicationQueue metric and creates events when this situation occurs.
When requests get backed up in your App Service, you’ll start to see timeouts in other parts of your application. You may also see adverse effects on the performance of your app service as it struggles to keep up with requests.
The root causes for high number of requests in the application queue are likely related to your application, but the troubleshooting steps are the same for most applications: