We currently have a REST API application that is deployed in an Azure VM via IIS. We used Dynatrace to monitor its performance, however there's a particular request that I'm finding hard to understand.
Based from the image above the web request took 14.9 seconds, however the request to the REST API only took 1.37 seconds. There was a self time of 13.5 seconds from IIS. What does this mean?
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It can be inside IIS, and for that you should check if "IIS Modules" is activated and verify if some module is consuming a lot. One such case I haven't yet solved is this one:
It can be something like Suspension, and you can check it in .Net metrics tabs of your IIS processes.
It can also be code running, and that you can check through "Method Hotspots" in your invoked services.