Custom metrics and dependencies are written twice to AppInsights by Azure Functions

[fgheysels]

I use Arcus.Observability in an Azure Function.
I typically have a configuration-setting in my Azure Function which is named APPINSIGHTS_INSTRUMENTATIONKEY to integrate my Azure Function with App Insights. This gives me built-in logging of my Function's usage to appinsights.

However, when I log custom metrics and dependencies, those metrics and dependencies are written twice to Application Insights: once as a metric (or a dependency) which is as expected, but they're also written as a 'trace' with a warning level:

Could it have something to do with this ?

I can offcourse change the name of the APPINSIGHTS_INSTRUMENTATIONKEY setting, but then I loose some functionality (like logs and metrics from the function host, so I rather don't do that.

[tomkerkhove]

@stijnmoreels Can you list all the providers that are added by Azure Functions please?

As far as I know, I think we cannot avoid this and the only way to mitigate this is use a different name for your key, but let's verify!

[stijnmoreels]

@stijnmoreels Can you list all the providers that are added by Azure Functions please?

When using our Serilog setup, in an Azure Functions project, before we call this ClearLoggerProviders... method, there are two ILoggerProvider types registered:

• Microsoft.Azure.WebJobs.Script.Diagnostics.HostFileLoggerProvider
• Microsoft.Azure.WebJobs.Script.Diagnostics.FunctionFileLoggerProvider
  Both are the ones that we filter on in the ClearLoggerProviders... method.