Application Insights -- add custom dimensions to 'requests' telemetry items generated by the host

Hi,

I’m really missing the ability to decorate each request with custom dimensions. I’m using the native functions integration with AppInsights, and I use ILogger – I wouldn’t want to install the AppInsights nuget and do all the initializations myself.

Optimal solution for me is to have a Dictionary as an optional input in the Function’s signature.

Is this by any chance possible today? If not, can you consider this as a new feature/improvement?

Many thanks ! Jonathan

[xstof]

Activity.Current.Tag(…) seems to work and translates into a custom property on the App Insights side. Would be good to have confirmation this is a supported way of working. Similarly, Activity.Current.AddBagage equally seems to work for custom tracking data which you want to pass onto any dependencies (and dependencies of those… all the way down)l. This is compatible with at least Service Bus and .NET Core Http.

[rjk]

The code from @mheskandari works for me to add to traces table, but that doesn’t include it in requests table. This makes sense: logs written from ILogger just go to traces table.

To add to customDimensions within the requests table you can do this:

httpContext.Features.Get<RequestTelemetry>().Properties["SomePropertyName"] = someData;

e.g. as described here in more detail https://www.davepaquette.com/archive/2020/03/07/enhancing-application-insights-request-telemetry.aspx

@xstof suggests above that you could instead use System.Diagnostics.Activity.Current.AddTag() to add custom dimensions to requests but that doesn’t work for me now (Application Insights v2.19.0). The tags don’t seem to go anywhere. Seems like it would be nice, perhaps I’m just doing it wrong.

If you want to add custom properties that are automatically added to dependencies (e.g. SQL) and traces tables you can use System.Diagnostics.Activity.Current.AddBaggage(), e.g. within a middleware class so this gets done at the start of every request. In my testing this does not get added to requests table though, so I need to do both this and the RequestTelemetry Properties as above.

string theTenantId = // get something from httpContext
System.Diagnostics.Activity.Current.AddBaggage("MyTenantId", theTenantId);