azure-app-insights | Playground to try out Azure Application Insights using Fix | Form library

I have a console application that using Application Insights to capture telemetry + logs. This is running just fine.

Now I am writing another app (a WPF based UI tool) as a way to "monitor" the console application. I would like this UI to retrieve the app. insights logs and display them with filtering capability.

To do this: Do I need to create another Azure AD Application and register it with app insights? Or can i somehow use the same Azure AD Application that's already been registered for the console app with this new WPF app?

Note: I am using this article as a guide. Here is another S.O. question that is directly related, but has no answers or hints of any progress.

I am trying to customise the name attribute for pageview events

This has previously been asked, for example How to provide custom names for page view events in Azure App Insights?

but this and all other solutions I've found (and the Microsoft documentation too) are working with an old version of the javascript snippet, of the form

The application insights sampling documentation (https://docs.microsoft.com/en-us/azure/application-insights/app-insights-sampling) states the following:

"For example, if for a failed request your app sends additional telemetry items (such as exception and traces logged from this request), sampling will not split this request and other telemetry. It either keeps or drops them all together."

It's hard to imagine but does this mean that some exceptions or better requests that caused an exception, might just get ignored and not logged if the sampling algorythm needs to reduce the amount of logging being done? I find it hard to place this in the correct context, just getting started with application insights and trying to figure out all the possibilities. I understand this is very valuable to filter out a percentage of telemetry for performance indicators etc, but for actual webapi requests for example..?

I've read this question but my doubt still remains: Azure App Insights Sampling (ItemCount)