System.Net.Sockets.SocketException when fetching metrics

[Wagnard]

.NET 8 (happen also on .NET 7)
app (Console) is under a container on Linux. (self contained)
Default metrics
started this way:

using var server = new MetricServer(port: 1234);
server.Start();

When the metrics are fetched, ex: " 192.168.1.240:1234/metrics " they work but they generate in the application :
Exception thrown: 'System.Net.Sockets.SocketException' in System.Net.Sockets.dll
Exception thrown: 'System.Net.Sockets.SocketException' in System.Private.CoreLib.dll

This happen 15 seconds after a metric fetch. So you need to fetch at an interval higher than 15secs to repro.

When using .NET 7 there was this workaround:

using var server = new KestrelMetricServer(port: 1234);
server.Start();

But in .NET 8 this workaround generate theses errors :

Exception thrown: 'System.ArgumentException' in Prometheus.NetStandard.dll
http.server.active_requests collection failed: The list of label values must have the same number of elements as the list of label names.