Azure App Service appLens – finding the root cause


There is a really cool new Azure App Service Web App tool called appLens that is explained in more detail here.  Open it by selecting the Settings –> AppLens from the App Service you are interested in analyzing, similar to that shown in Figure 1.

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Figure 1, AppLens shows this is an application issue not a platform issue

Looking at the output of the report I see that there was some some down time on 3-JUN-2016 at around 00:30.  I then decided to take a look at the Event Viewer logs accessible via the KUDU console which I discuss here and here.  And what I found is shown in Figure 2.

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Figure 2, why my azure app service web app is not working

It turns out that this was because an old issue with my web app that I discussed here and here.

And the Warning event 2299 logged just after the one shown in Figure 2 further proves the root cause.  The detail for event 229 is:  Worker Process requested recycle due to 'Status Code' limit.

I also took a look into my IIS logs and see the 500s recorded, then after the restart all is back up and running.  I might actually fix this one day…

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