Hello, I've just updated from version 4.1 to 4.2 and I'm now seeing the exception above.
It's a .NET 6 project and I'm doing DotNetRuntimeStatsBuilder.Customize().WithThreadPoolStats().WithGcStats().StartCollecting().
Reverting back fixes the problem, but I am frankly not sure if all the metrics are really emitted since the project is in development and there is nothing scraping it yet.