SignalR active connections meters metric not working.

[stewieoO]

.Net version; 8
prometheus-net version: 8.1.0

When using the default .net meters integration, the signalr.server.active_connections metric has no value.
Reference:

However when listening to the metric directly it shows the correct values.

I have created a sample repo that reproduces the issue.
Simply start the app and it will connect to the signalr hub. In the console you can see the output of the .net metric listener and each time you press f5 it decreases and then increases the count.

However if you navigate to /metrics it shows that the metric exists, but it has no value. I would assume this is an issue with the UpAndDownCounter?