From the previous post on building NServiceBus metrics, I've pushed a new version of the NServiceBus.Extensions.Diagnostics and OpenTelemetry packages:

As before, the OpenTelemetry packages are just small wrappers around TracerBuilderProvider.AddSource and MeterBuilderProvider.AddMeter so they aren't strictly necessary but maybe look a little cleaner?

The OpenTelemetry package is a pre-release package as the Metrics support in .NET OpenTelemetry are still in RC (the exporters). Metrics themselves are part of the System.Diagnostics.DiagnosticsSource 6.0 release.