Yesterday afternoon while doing some work I ran into an issue in Azure. Initially I thought this issue was due to a bug in my (new) code and went to my usual debugging helper Application Insights to review what was going on.
The below graphs a little old, but you can see a clear spike on the left of the graphs which is where we started seeing issues and which gave me a clue that something was not right!
Initially I thought this was a compute issue as the graphs are for a VM-hosted REST API (left) and a Functions-based backend (right).
At this point there was no service status indicating an issue so I dug a little deeper and reviewed the detailed Exception information from Application Insights and realised that the source of the problem was the underlying Service Bus and Event Hub features that we use to glue…
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