When Azure App Services are running normally, you can generally expect a steady number of IO operations in your application. Blue Matador can determine when this is not the case by watching the IoReadOperationsPerSecond and IoWriteOperationsPerSecond metrics and creates events when the number of IO operations are anomalous.

    In general, anomalous IO operations are probably not a cause for concern and are mostly useful for correlation with other issues in your infrastructure. Anomalous IO operations can occur for any of the following reasons:

    • A snapshot or backup is being run on your app service
    • Increased traffic to your app service
    • Modifying your app service’s configuration

    If you determine that the difference in IO operations received is significant, enable and check the diagnostic logs for your app service. This can help you find where the extra IO operations are occuring.